My Win7 machine was working great, and it could reboot normally without problems. Then, I installed Win8 with an MSDN version. It offered to keep my personal files as an upgrade option (I later realized this just meant a clean install, and my old Windows existed under c:\windows.old).
Anywho, after the initial system check, whilst in Win7 it started installing files. After rebooting for the first time, my system shut down.
I went to hit the power button, but it wouldn't respond. I had to reset the power supply before my computer would turn on. Whether I reboot, or shut down, I now have to reset the power supply to turn my computer back on.
Any tips? Thanks.