what am i doing wrong

i just got my gateway computer back plugged everything up but my monitor say no signal detected then proceeds to go into sleep mode why is that?
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  1. Best answer
    You need to post your computer stats and a bit more information. Does the system post? Do you get into Windows? Have you changed anything recently (hardware/drivers/software/etc)? Are you OC'ed? Have you tried moving to a different output on your card? Have you re-seated your graphics card?
  2. Have u tried changing the VGA Cable (the cable connected from monitor to cpu)? One thing is to make sure ur VGA cable should be connected properly.
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