Power & Boot Issues
Troubleshooting computers that won't turn on, random shutdowns, and failing power supply units (PSUs).
PC Won't Turn On: The Complete Troubleshooting Checklist
A methodical checklist for diagnosing a desktop PC that won't turn on, from power cables and PSU switches to motherboard and CPU-level faults.
Diagnosing and Fixing Random Shutdowns
Find out why your desktop PC randomly shuts down or restarts, with a practical diagnostic process covering heat, power, drivers, and hardware faults.
How to Test and Replace a Failing Power Supply (PSU)
Learn how to safely test a suspect PSU for faults and replace it correctly, with wattage guidance, cabling steps, and troubleshooting tips.
Understanding Beep Codes and POST Errors
Decode motherboard beep codes and POST error messages to quickly identify what's stopping your PC from booting properly.
Fixing a PC That Boots But Shows No Display
PC fans spin and lights come on but no picture appears? A step-by-step guide to diagnosing and fixing no-display boot faults, from cables to GPU seating.
CMOS Battery Problems: Symptoms and How to Replace It
Learn the tell-tale signs of a dying CMOS battery, such as clock resets and lost BIOS settings, and how to safely replace it in a few simple steps.
Why Your PC Restarts Instead of Booting Normally
PC stuck in a reboot loop before reaching Windows? Learn the common causes, from PSU and overheating to corrupted boot files, and how to fix each.
How to Reset the BIOS/CMOS Safely
Three safe methods to reset your BIOS/CMOS settings to default, using the BIOS menu, the motherboard jumper, or removing the battery, with full steps.
Diagnosing a PC That Powers On but Fans Don't Spin
Case lights up but no fans move? A methodical guide to diagnosing whether it's a fan cable, PSU, motherboard header or short-circuit fault.
More from Desktop PC Repair
Hardware Upgrades
Step-by-step guides on installing new RAM, upgrading graphics cards, and replacing CPUs.
Cooling & Cleaning
Deep-cleaning dust out of cases, reapplying thermal paste, and fixing loud case fans.
Storage Drive Troubleshooting
Diagnosing failing hard drives and SSDs, cloning drives, and fixing storage detection problems.