Problem is in the title thread. Windows turns off, screen goes into power saving mode, but lights are still on and fans are still whirling. When I try to turn it off in save mode, it freezes on "shutting down computer".
It will restart although it takes ~30 seconds to do so.
Problem started last Friday. I haven't installed any new hardware since Wednesday, when I installed my HDD. I might have updated a driver, but I can't recall.
I've reset the BIOS back to original settings also, but that's had no luck.
Also, sometimes it takes very long to boot up - up to 2 minutes. Most of the time it takes ~20 seconds though.