After some help, my computer over the past few weeks has started to play up. I can be working/browsing internet/playing games and the computer will completely freeze. Seemingly at random, however it seems to happen more when watching youtube videos. Eventually the computer will right itself and carry on as if nothing has happened. The link to the video below shows it.
http://www.youtube.com/watch?v=_9BTFT-I43E&feature=youtu.be
The Spec of the computer is-
Graphics card- radeon HD 6870
Processor- intel core i5-2500k
motherboard- Gigabyte Z68X-UD3P-B3
PSU- GX 550W
With windows 7 home premium 64 bit
Thanks in advance! Gaz
