I'm starting my first job this Wednesday, and my desktop computer stopped booting shortly after I got the job. While playing a game, the screen suddenly went black, although the fans, lights, and other peripherals stayed on. The computer would not respond when I held the power button, so I eventually had to unplug it. After reconnecting it, the monitor showed its startup logo, but the screen went black again and the keyboard lights never came on. The keyboard works normally on other computers. I cleaned the PC, cleared the heatsink, reapplied thermal paste, and cleaned the fans, but nothing changed. What should I test first, and could this be the power supply, RAM, motherboard, or graphics card?
3 Answers
A failing power supply is one of the stronger possibilities, especially since the computer has had similar black-screen events before and now will not respond reliably to the power button. It may still provide enough power for lights and fans while failing under load or not supplying stable power to the motherboard and graphics card. The safest option is to test with a known-good compatible PSU or have the PSU tested with a proper tester. Avoid opening the PSU itself, and be cautious with paperclip testing because it only checks whether the unit starts, not whether its voltages are healthy.
You can also clear the CMOS: unplug the computer, remove the motherboard battery for several minutes, reinstall it, and try starting again. Before that, check that the 24-pin motherboard cable, CPU power cable, graphics-card power cables, and monitor cable are firmly seated. Look for motherboard diagnostic LEDs or beep codes if the system has them. If minimal hardware and different RAM combinations still produce no keyboard initialization or display, the motherboard, power supply, or CPU will need to be isolated with known-good parts or tested by a technician.
Since you need a working computer soon, contact your new employer immediately and explain that your home PC has failed. Ask whether you can use a loaner, work remotely from another computer, or delay the start while troubleshooting. Borrowing a laptop from someone is likely faster than trying to identify a failed component without spare parts.
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