Thanks for the quick replies! So far, I've done 3 of the 5.
1. Temps seem normal (from what I can tell). CPU peaked at 63C under load in a game, and averaged about 50-58. GPU was about 40, and Motherboard/HDD were averaging around 33.
2. I've cleared this (I think) by choosing the Load Default Settings option. The CPU was advertised as OC'd, so I'm not sure if this reset it or not (and whether that's a cause of the problem)
4. I did have Asus AI Suite installed, which I didn't know of. I've uninstalled it now.
3 I've been checking on, but I'm unsure how to figure out exactly which version my BIOS is at. The board is
this one, and from what I can tell, is at version 0502 from what I've seen in Speccy and others. Yet when I try to install the latest version, it tells me that my computer doesn't meet the requirements for this update. So I'm a bit stumped as to what to do next.
And obviously 5... well, I'm hoping it doesn't come to that!