PC only booting when on its side with casing open

zyukay

Prominent
Sep 12, 2017
1
0
510
I am currently having the most interesting dilemma with my custom-built PC: it will only boot if the tower is on its side, and the casing is opened. As soon as I try to put the casing cover on or turn the tower right-side up, the display will become distorted then go black. Once I turn my PC off and back on, it will not boot until I put the tower on its side and open the casing. What could be causing this problem?

I built this PC 2 years ago, and it has not given me any trouble until now. This started happening yesterday when my display suddenly went black as I was using my computer. When I turned it off and back on, it would not boot. It would only turn on the fans and LEDs.

Does anyone have any idea what could possibly be going on??

SPECS
MOBO: MSI H81M-E33
PSU: EVGA 80PLUS 500W
CPU: Intel i3-4160
GPU: XFX AMD Radeon HD-6950
RAM: G.Skill Ripjaw DDR3-1600 4gb x2