Ok, so for context I got this computer about a year ago. It has a 1080ti i7 7700k, was generally a pretty good deal. No major issues for the rest of the year.
I had it unplugged from the wall and turned off for about two months and now it won't boot. Case fans aren't spinning and water cooling isn't starting. Mobo and GPU have standby LEDs on indicating the 5v of power and power button has no effect. I had recently dusted the computer with compressed air