Electrical Buzz then Stall
Not exactly Win 8 but it's been more common since using that OS.
A while ago I swapped Win 7 for Linux and at some point, the computer would make an electrical buzz and the system would partially stall for a few seconds. Mouse pointer worked but couldn't interact with what is on the screen. Fast forward to today and I am on Windows 8 but the problem is happening more often. It normally happens after moving the mouse and clicking on something, just now it did it after being AFK and the screen coming back from blank.
Anyone ever come across this weird problem? It's bizarre how I can still move the mouse during the stall but not interact with anything. Computer carries on like nothing happened after that.