1. Start with the whole PC
Parts of a Computer and Their Functions
Use the overview diagram to put a name to each main component before exploring the individual parts in more detail.
Identify every PC part →Practical computer knowledge
Computer Guides and Tutorials
Computer Guides and Tutorials help you identify PC parts, investigate hardware problems, and plan upgrades for a Windows PC. New to the hardware? Follow the reading order below. If something is wrong, choose a symptom to find your first checks.
15 focused guides Free to read
Computer fundamentals
Learn how your computer works
New to PC hardware? Read these five guides in order. Start with the whole computer, then explore its connections, processor, startup process, and display. If you already know the basics, skip to the part you want to understand.
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2. Find the connections
Parts of a Motherboard and Their Functions
Move from the full PC to its main board. Locate the sockets, slots, and ports for the parts you just learned about.
Identify motherboard parts → -
3. Look inside the processor
Parts of a CPU and Their Functions
With the CPU's place on the board clear, explore its internal parts and follow how they work through an instruction.
See how a CPU works → -
4. Follow the startup process
Understanding the BIOS and Its Main Functions
Follow the steps between pressing the power button and loading Windows, then get familiar with BIOS and UEFI settings.
Understand BIOS startup → -
5. Understand the display
What Is a Monitor, and What Are the Various Types?
Finish with the screen you use every day. Learn how to read panel, resolution, refresh rate, and connection specifications.
Compare monitor types →
Troubleshooting and maintenance
Troubleshoot PC hardware problems
Write down what happens, when it started, and any recent changes. Choose the closest symptom below, work through one guide, and record the results before moving to another test.
A freeze alone does not identify the failed part. Intel's system freezing checklist covers several possible causes, including heat, power, memory, and software.
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Slow during everyday tasks
Why Do Computers Slow Down With Age?
Start here for slow apps or a sluggish desktop. Compare software load, storage, and heat before deciding whether an upgrade is needed.
Find the slowdown cause → -
Slows down as it heats up
How to Know If Your CPU Is Thermal Throttling
Check heat limits and throttling indicators when speed drops under load. Use the readings to decide whether cooling needs attention.
Check for CPU throttling → -
Memory errors or missing RAM
How to Check If RAM Is Working Properly
Check the amount Windows detects, run a memory test, and use the results to investigate a stick, slot, or speed setting.
Test your computer's RAM → -
Display glitches or game crashes
How to Check If a GPU Is Working Properly
Work through detection, display connections, drivers, cooling, and a benchmark to narrow down a graphics problem before replacing the card.
Run the GPU checks → -
Suspected processor instability
How to Check If a CPU Is Working Properly
Review processor detection, error logs, and stability tests when you suspect the CPU. Follow the fault checks before drawing a conclusion.
Test your CPU safely → -
Checking a RAM connection
How to Clean RAM Contacts
Read the cleaning precautions before removing a stick, then follow the guide to reseat it and check for a change.
Clean RAM contacts safely →
Upgrades and everyday use
Plan PC upgrades and improve performance
Choose a specific goal before buying parts or changing settings. Note your current results, make one change, and compare afterward. Use the guides below for hardware upgrades, case cooling, running costs, or Windows sign-in.
For a slow Windows PC, try Microsoft's PC performance checks before shopping. They cover startup apps, storage space, updates, and other fixes to try with your current hardware.
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Choose a hardware upgrade
How to Upgrade a PC
Start with the task you want to improve, check part compatibility and cost, then plan installation and a test of the result.
Plan your PC upgrade → -
Improve case cooling
PC Airflow Optimization: How to Cool Your Computer
Use this after checking temperatures or when planning a desktop build. Work through fan placement, airflow direction, and cooling checks.
Set up better airflow → -
Review running costs
How Much Energy Do Gaming Computers Use?
Estimate electricity costs from power use, hours played, and your local rate, then compare ways to reduce energy use.
Estimate gaming PC costs → -
Change Windows sign-in
How to Set Up Windows Auto Login
For sign-in convenience, compare the setup methods and their security tradeoffs before choosing one for your computer.
Set up automatic login →
About these guides
Computer advice grounded in real IT work
Marlo Strydom writes these guides from more than 20 years of work with computer hardware, Windows systems, electronics, and technical support. If your topic is missing, suggest it through the contact page.
Suggest a computer topic →