Monitor no signal

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http://www.daniweb.com – Hello everybody, Every time I turn on my pc after around 5-10minutes my monitor is giving me the no signal or cable connected message. I can't do anything to make it work again. I have to close the pc wait 15 minutes then i turn it on again, it works perfectly and after 5-10minutes i get the same message no signal... My pc is still running because i click randomly and it seems that it works. I really have no idea if its my monitor or my video card or even the motherboard. Can anyone help me please?^^ Ovidiu (General)