Hi, I have noticed that there are many threads like this around and I have read some but every case is sort of individual so I thought it may be best to start a new thread. I recently got a new computer built for me, but when I am playing games, specifically World of Warcraft it keeps restarting itself. When I first had the computer less than a week ago I played Quake 3 on it and it seemed fine, then I put in a Wirless Card in the PCI slot below the graphics card and it seems to be restarting on games. I downloaded the .NET Framework version 2 and it seemed to have sorted the problem but then after about 1 hour of play the problem started all over again. My Spec is: AMD Athlon 64bit 4000+ with Fan MSI RD480 Neo2 ATI Radeon x850 XT Fuelled by Sapphire (Has a fan) Sansun 600w PSU 2 x 1GB RAM 2 x Hiper 80 mm UV case fan 300GB 16MB Cache Hard Drive DVD-RW (cant remember the spec) The only otherthing I can think of mentioning is that one of the fans makes a noise, I think it hasnt totally bedded in properly. I hope this will help you, anything else I will try but my knowledge of computers isnt that vast. Hope someone can help its driving me nuts.