I've had this computer for a few months now and it has been working fine. But recently the gpu activity would surge to 99% whenever I played L4D and the temperature would go to above 55C at 55% fan speed which isn't normal. So I thought maybe a something was loose so I reconnected everything and I get this on my monitor "you have not connected one of your video card power connectors to the power supply." But on the video card there are no lights lighting up so I assume everything is connected in fine. Any ideas?
By the way I'm using a 650W psu so I don't think its the power supply.
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