Sort of a weird problem here. A while back I started installing the Windows 8.1 update, then went and took a nap. When I woke up, my PC was on but showing a black screen, like it had failed to boot. So I restarted it and pressed tab to display the startup info, and it was hanging on "Auto-Detecting AHCI PORT 1...," which is my hard drive. I then had to clear CMOS so that I could get into the BIOS to switch my SATA configuration to IDE mode, and from there everything worked fine. I was worried about switching from AHCI to IDE, since I know Windows can have problems when you do the opposite, but everything seems okay.
My question is, what the heck happened during that update that caused my motherboard to stop recognizing my hard drive in AHCI mode? And is there any way I can get AHCI mode back? I know there's really not much benefit over IDE mode, but it's just one of those little things that's gonna bug me now.