Hello I have just recently went over to a friends house and I brought my cpu along. Well we were trying to fix his and were using mine as a model to see what goes where. I opened it up and tilted it to get a good view. Then I closed it back and turned it on but the monitor said no signal. I had my cpu on earlier and it was workimg fine until now. Everything else is on just the signal thing. Could anyone help me please? It would be appreciated.