Hp wont boot at all

Hello, when i turn it on it makes some noise, the light goes on, but the monitor says no input signal. I can't even get it to boot in safe mode - help?!?
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  1. In order to help we'll need much more information, please.....
  2. it is an hp desk top (3 years old) with Windows 7. I downloaded a free game just prior to the problem starting. I replaced the video card (my brother did) and that didnt help. What else can I tell you that would be helpful? It seems like it might be the processor but how can i figure out what is causing it?
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