9 Ways To Know if You Need a New Power Supply

A proper functioning power supply is the most crucial part of any PC. Problems with power supplies can be detrimental and very expensive, depending on the rig you have.

Here are 7 ways to know if you need a new power supply:

  1. Age.
  2. Programs crash without corresponding software issues. 
  3. You experience random blue screen crashes.
  4. You hear unknown PC case noises.
  5. Fans turn on but nothing else.
  6. GPU-intensive programs start having issues. 
  7. You notice visual power fluctuations.
  8. Running multiple devices yields poor performance.
  9. Swollen electrolytic capacitors.

Faulty power supplies can cause all sorts of problems, and are sometimes difficult to narrow things down too much without the proper test equipment.

Note: I would like to point out that the proper way to test a power supply is by using a power supply tester with a dummy load. Since this equipment is not usually used by everyday computer owners, this article is about trying to find an answer without using the proper test equipment.

So here are a few things to look out for to diagnose whether or not it’s time for a power supply change.

Replacing your power supply or seeing malfunctions with your PC can be worrying, but read on for some easy ways you can tell in what shape your power supply is in.

an older style power supply

1. Age

This is probably one of the more conclusive ways to determine whether your power needs replacing.

Power supplies generally tend to last around five years, with the exception of some manufacturers making more durable power supplies with warranties spanning for ten years or more.

If your power supply exceeds the five-year age, it’s most likely time to replace it. Providing your computer’s components with good quality power ensures longer life and better performance.

This is especially true if the power supply in question is of the cheaper variety. But, unfortunately, there are many cheaper power supplies out there that I encourage people never to use in the first place.

2. Programs crash without software issues 

computer error with a concerned woman staring at the screen

If programs randomly crash without a corresponding software issue, it can signify that your power supply isn’t strong enough to run them.

Check the code integrity of your programs. If you don’t see any flaws or issues, check other troubleshooting.

Sometimes, there are new updates that need to be installed. Other times, programs aren’t suited for modern computers and need help with modern operating systems and graphics cards.

Make sure to look in program forums for any issues that could mimic what you’re experiencing. Many people who post in forums are programmers or enthusiasts who know more about PCs than the average person.

If you can’t find reasons for your computer’s issues, you should check your power supply.

Sometimes, programs crash due to system instabilities caused by the power supply when the computer experiences a heavier workload.

3. You experience random blue screen crashes

blue screen of death zoomed in

If you’re experiencing random blue screen crashes with no explanation, you may be having power supply issues. 

Verify that the blue screen crashes are not from your activities. Sometimes, users can cause issues with their operating system by accidentally getting into something in the base code. 

Occasionally, programs can work poorly together and cause problems.

Sometimes, operating systems have issues that happen during common runtime. However, this is less common unless you haven’t regularly updated your device or have contracted a computer virus.

Check forums to see if there’s any explanation other than power supply issues. As with the crash issues, many computer experts could be able to help.

If you don’t find anything, it may be worth checking your power supply.

Blue screen crashes usually mean that something is going on with the primary operating system. Sometimes, the power fluctuations can cause the OS to have issues.

So, in this case, the computer is failing to keep your components running correctly.

4. You hear unknown PC case noises

opening computer case

Sometimes, unknown noises mean that something has come loose or is having issues.

When you hear an odd noise, check all your devices. It could also be good to take apart specific devices and examine their parts if you can or know how.

However, don’t take apart your power supply; you could seriously hurt yourself.

A high-pitched hiss or whine could be caused by electromagnetic interference from things like power strips or lights. Move your power supply away from the interference and see if the problem persists. 

If the noise continues, you may have faulty internal components and need to replace your power supply.

Unplug your power supply and leave it alone until you can replace it.

5. Fan turns on but nothing else

computer turned on with only fans running

If your fan is the only device turning on, your power supply may have connectivity issues or cannot provide enough power to your setup. This creates a domino effect throughout your PC.

Make sure that all the wires are correctly connected and aren’t damaged. Check for any sorts of issues, like exposed wires or cracks.

Devices under high stress might manifest problems they didn’t have before. Likewise, vibrations or rubbing up against case walls can wear down your devices during regular use.

This is the most common sign that power isn’t getting transferred to all devices within your PC.

However, it can be a sign of other issues, so it’s best to check many different parts of your PC before confirming the power supply.

Sometimes, issues with other parts can make the power supply function differently than it should normally.

If they’re routed through the power supply, it can cause problems through the whole grapevine.

6. GPU-Intensive programs don’t start or run

cad drawing of graphics card

GPU-intensive games or programs can also be a good indicator that your power supply is having issues. If they struggle to start up or run consistently, that’s a good sign that you have an inadequate power setup. 

To test if this is the cause, close all programs using the Task Manager. Then, open and run a game or program that subjects the GPU to a heavy workload.

This can be anything from video games to mapping programs. Anything that could put your PC under stress could help.

Your computer’s performance will suffer if devices aren’t being appropriately powered. This is the best way to check and see if you need a new or upgraded power supply.

It’ll quickly determine the issue and be much easier to fix than something like a wiring issue.

If you see a significant decrease, it can be related. Your power supply could be struggling to keep up, and your graphics card could start to operate abnormally, run hotter, or drop frames.

It may be worth mentioning, for this test, that your graphics card could be the reason for the malfunctions, so I recommend that you test it to see if it’s the culprit or not.

7. You notice visual power fluctuations

inside a computer with led lights

Sometimes, issues with a power supply can manifest visually to the naked eye. This can be very easy to spot and be your first clue that something isn’t right.

If you have lights in your PC case and can see them flickering, it’s a tell-tale sign that your power supply is having issues or is inadequate for your setup.

Lights are susceptible to power fluctuations and can be an easy place to start looking for problems. 

Have you ever been in a home where the lights flicker when the air conditioner turns on? That’s because the voltage drops when major appliances pull away from the main power supply.

The same effect can happen with your PC.

You can also look at other lights on your device. For example, if you have strip LEDs in your PC case, those can also show signs of electronic stress.

Verify the integrity of the wiring, and then check your power supply.

8. Running multiple devices yields poor performance

back of a computer with usb cables connected to it

Running multiple devices from the same power supply can put extra stress on it and slow down performance. 

First, make sure that your power supply is rated for the devices you are connecting to it. If they aren’t, you need to upgrade your power supply.

You may get external USB devices not being recognized. Just make sure that it isn’t a USB cable that’s inadequate before condemning the power supply.

9. Swollen electrolytic capacitors

a swollen faulty capacitor in a power supply

An easy tell-tale sign that your power supply is past its due date is by looking at some internal electronic components, specifically, the capacitors.

Once the capacitors age, they start bulging, and the most obvious place to see this is on the top of a capacitor.

The top of the capacitor will protrude convexly, giving the appearance of a small dome.

In some cases, it won’t be easy to see through the vent holes of the power supply. Therefore, I do NOT encourage you to open the power supply and take a look.

Some large capacitors hold lots of electrical charge that can potentially give you an uncomfortable shock or worse.

If you are unable to see inside, I’d advise that you give this step a skip.

How to know if you need to upgrade your power supply

There are a couple of ways to know that you need to upgrade your power supply.

a new modular computer power supply on a table surface

Upgrades were done on the PC

If you have recently upgraded other parts of your PC, you could need a new supply to support them and the rest of your PC.

Wattage too low 

You have to check on the power supply compared with each component’s wattage requirements. If the power supply’s total wattage falls short, you should upgrade your power supply as soon as possible.

Inadequate wattage can be dangerous and impact your overall performance.

Running devices with a lower power supply or lower wattage tolerance can be dangerous and a safety hazard. In addition, increased temperatures can melt wire coatings and potentially melt other parts or cause a fire.

Once you’ve verified if you need to upgrade your power supply, turn your computer off and wait for a suitable replacement.

Important: I don’t recommend using the computer until you are able to get a new power supply installed.

Choosing the right power supply for you


Recommended Power Supply

Corsair RM850 850W Modular Power Supply

With such great value, it’s worth going with the extra wattage to future-proof your computer, and it will handle most gaming computer’s demands.

Made by Seasonic, you are guaranteed the best quality power supply on the market. Seasonic is the best of the best, providing you with a truly long-life product.

The quiet operation will ensure that you won’t have any extra noise added to your system while delivering high-quality, stable power to your entire computer.


Make sure to research the power supply you want to upgrade to. It would be best to verify that it’s from a reputable dealer. If you don’t, you risk running into problems later on.

While it can be tempting to snatch up a cheap deal on a power supply, make sure you know what you’re purchasing.

The lowered cost can come with potential issues in the future. They can even cause safety problems.  

Choosing a suitable power supply is a more complicated question. It would be best if you considered your current setup before anything else. You can also select based on three options: 

Price

Another thing to consider is the price of the power supply. Sometimes, there are terrific deals on power supplies out there.

For example, many companies will have discounts when you buy power supplies with other PC parts, or they might offer special sales for holidays.

However, like most things in the tech world, you get what you pay for. Therefore, if you go for a good deal, you may run into specific issues with the quality and the materials used to build your power supply.

It can be better to spend more money now than pay dearly down the road with damages. Good quality power supplies don’t cost a whole lot more anyway.

It may simply mean paying an extra 50 to 80 Dollars, not exactly enough to break the bank. However, it’s money well spent knowing that your computer is getting reliable and good quality power.

Future builds

It would help if you also thought about using your power supply for newer builds in the future.

If you’re going to grandfather in various PC parts with future upgrades, you should choose a more modern power supply with a higher wattage rating.

This will allow it to handle future parts that require a higher level of power and prevent your power supply from needing replacement once again.

Wattage

9 Ways To Know if You Need a New Power Supply 2

The wattage value of your power supply determines how much power it can deliver based on the need of the sum of all the components in your computer.

If it’s too low, the power supply will run hotter as it cannot keep up with the demands of your system’s components.

You can always go much higher than what’s required, but that is simply a waste of money. So the idea is to have a little headroom and call it a day.

Always bear in mind that the power supply unit needs to be matched the form factor of your computer’s case.

So before you think about purchasing that slightly larger power supply, make sure it will fit and mount correctly.

If you’d like to know more about the power supply specifications you need, read my article about how many watts should a gaming PC have to give you a better idea about the correct one to purchase.

Proper ways to test a power supply

As I mentioned at the beginning of the article, there are proper tests that can give you a better insight into the condition of your power supply.

Method 1:

One way is to purchase a power supply tester:

This is great for an initial test, but it doesn’t subject a power supply to the load it would have when powering a computer with a graphics card.

Method 2:

Professionals use elaborate test equipment that isn’t commonly found in stores. These testers can perform a detailed analysis of all the power rails generated by the power supply while applying a load amount of the tester’s choice.

An example of one of these testers is the Sunmoon SM-5500ATE.

Seeing as it’s unlikely for most people to own equipment like this for themselves, DIY’ers have been putting together their own dummy load circuits and use a multimeter to test each voltage output.

This is cruder but can be somewhat effective. The only genuine test is to apply a great enough load on the power supply while measuring it over a certain period of time.

Conclusion

That covers some of the more common symptoms and telltale signs that your power supply needs replacing.

I’ve come across other symptoms less commonly experienced from a faulty power supply in my time repairing computers.

Some of these include:

Seeing as how important power supplies are in a computer, it’s not a stupid idea to keep one spare for your system.

It can also serve as a great way to eliminate power supply problems if you aren’t entirely sure which hardware component is the cause of your issues.

This is largely true because everything relies on power to work. Therefore, the quality of the power can determine how well or reliably each and every component works.