my PC is self sutti g down, after about 30 seconds, i changed back my MB to better case and turned on, it was running, then first time i was like oh, maybe i pressed wrong button, but then second time was nothing only waiting for boot up, and then shutdown. I have chcecked the standofff screw if no of them is sorting something with MB, but all standoffs were installed correctly, tried cmos reset, nothing, help please