i have power supply which is 450 watts.. but when the electricity is gone my computer restart... i have shapphire redeon hd 6670 1gb ddr5. i could not realize what is the problem??? when i play game then restart.. but when i dont play game.. the computer does not
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Check your system event log to check for errors associated with the restart. This could be a lot of things including drivers. Is it happening with all games or just certain games. Have you tried stress testing the system with Prime95/Furmark?
450 Watts, even if it's made by the most brain dead engineers on the planet, is still MORE than enough to power a 125W CPU and a 6670. Check for Dust build up in the case and clean it out. If that doesn't fix it, then you're looking at a dead Power Supply, or at least one that is soon going to die.