It might be the power supply. There are boot-up error readers - a little troubleshooting board you can plug into a PCI slot or somewhere else on your motherboard. t will confirm if all the voltages are in range and stable, and can also determine if other devices are faulty. Like, even if a CPU fan froze up, the computer won't boot. These error-reading devices flash codes, and include a cheat-sheet for you to look up what the code means.

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