My computer off when play game

I had to change the motherboard ASROCK G41C-GS and when i change the motherboard, i have a problem with my window so I format my computer to windows 7 ultimate 64 bit, when I play games my computer off. My PSU probably 3 years old.
this is my spec 
Intel pentium dual core E5700 3.0gh,z, 2 ddr2 2gb ram,PSU 400 watt and asus nvidia G210 512mb gddr2
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