Quote Originally Posted by Howazi View Post
PSU is 1000W so should be more than sufficient.
How old is the PSU? I didn't really think about this until I had a similar problem, but they do go bad overtime. I had a 1200W one (never used anywhere near that much) and it was 5 and a half years old and the computer would randomly black/blue/power off (problems got worse/more frequent over time).

Eventually I replaced the power supply, problems went away :S Not easy to test unless you have another one, but just wanted to say don't rule it out yet.