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i bought a new motherbord it's a gigabyte GA-G41M-ES2L it came with a built in graphics card but i already had my geforce 9400 gt card but when i start the computer it won't work monitor only disblay in the built in vga but when i reset the computer the geforce card works , a few days ago i replaced my powersupply and my geforce card wont work any more even when i reset my system i dont know what to do