Compaq Presario sr5490an won't respond after a restart

So I just went and shut down my Compaq Presario SR5490AN and let it be for a bit cause it needed a reboot at the time however when I press the start button later it wouldn't start.The lights and fans will go on but the rig won't actually make any noise and the monitor says 'No Signal'. I already checked the power supply which is fine, and I've looked through the 'guide' given on HP but that didn't really help. I'm worried it's the mobo (Asus IPIBL-LB) and I really really don't want to have to buy a whole new rig, plus I can't find anyone selling a replacement IPIBL-LB. Anything else I should look for before sinking a lot of time and money into a new PC or is there nothing I can do?

I can provide other specs as needed and it's OS was Vista
 
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