Blue bars down screen

[Lonz]

I was doing some casual Facebooking, and streaming some music in the background and had the lovely experience of the screen flashing white, going black then coming up with blue and black bars down the screen (shown in image 1):

http://imgur.com/a/adITd

On rebooting I get this screen in Image 2

After booting into Safe Mode I don't get any of these problems however, so I'm wondering whether it's a software issue? I'd find that strange since I wasn't doing any Windows Updates or similar.

This is all on Windows 7, with an ATI 6800 graphics card.

Any thoughts?

 

[Lonz]

Thanks for all your responses. It looks knackered to be honest. I've let it all cool off over night and I'm getting the same problem this afternoon.

I'm now trying to work out how to enable the onboard graphics so I can at least get something done it until I get a new card delivered, but not having much joy.

 

[Lonz]

Well, I've given the outside a bit of a wipe down of any dust and I don't know how it's happened, but I've just turned the PC on again to try get into Safe Mode and everything seems to be working fine again.

Bizarre.

Could have been a blocked fan and therefore overheating like has been suggested? Will see how long it holds out.