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Follow these steps
if, when you turn your computer on, it promptly powers back off.
You'll probably hear the fans inside your computer turn on, see the
lights on the front of your computer turn on or flash, and then it will
all stop - always before the boot process is complete. You may or may
not also hear beeping coming from inside your PC.
Note: As in the previous scenario, don't worry about what state your monitor is in. You may have a monitor issue as well but it's not possible to troubleshoot it quite yet