Windows 8 Pro, Sony VAIO VPCF121GX
I've started having complete system hangs over the last few weeks. My fan starts spinning full speed, the mouse stops responding, and the only solution is to manually hold the power button to shut down the computer. This happens in IE10 or Chrome under fairly light usage, maybe 5 tabs open.
First I tried restoring from a restore point before the problems began, then I tried a full system refresh. The last resort is reinstalling Windows 8, but I'd like to avoid that.