Question computer turns on but no display and none of my peripherals work

Karoths

Honorable
May 18, 2015
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my wife was playing games just the day before on her pc but when she went to turn it on yesterday she said it wouldn't work the pc lights up with rgb and the fans run but no post for bios and the display doesnt kick on either. The peripherals like the kb&m doesnt even come on and no audio through speakers or headset.

whats wrong with it? and how do i fix it?