No errors or anything, however I just tested this PC with a different power supply and guess what, everything went fine, I could play for twenty minutes or more, then I just turned the game off since this shows it's definetly a power supply issue. The PSU I used is my neighbours, so I can't take it from him now, that's too bad lol.
PSU I tested wtih: Atrix 650w Transparent Power Supply
I remember I bought it about a year ago since the neighbours PC is my old PC that I sold him...
http://www.******.co.uk/atrix-650w-transparent-power-supply-22920 Censored store is M A P L I N
It's probably not one of the best PSU's out there, but it worked real well, it feels real sturdy and a proper PSU not like I currenly use...
I've noticed they Atrix now sells different version of this PSU, which I doubt are better than I had previously...so I guess my options are:
1. Buy exactly same PSU from internet - I am guaranteed it will work.
2. Buy a similar Atrix 650W newer vesion which I doubt is as good as the old one.
3. Buy something you guys recommend, something cheap, reliant and known to be a good PSU, I am not willing to pay a lot for it though...