site:tomshardware com dell inspiron 530 comes on but nothing will show on scree

i have a dell inspiron 530 desktop computer i just replaced the power supply and replace the motherboard with a rebuilt one an it will come on and go right back off tried to change the battery with the one out of my old motherboard and that is the only way i could get it to come on at all and when it does come on there is nothing on the screen
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  1. Is the graphic card installed?
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