Hello, Im having some trouble installing my new graphics card and power supply. My old default power supply is 300w, im upgrading to a corsair 600w. Graphics are nvidia geforce 9100, upgrading to a Gtx 550ti. So the problem im having is that the new power supply doesnt have pins to connect to the old onboard graphics card so i cannot install my new graphics card. the 550ti requires 400w so i cant install it on my old psu. any help. When i turn my rig on lights and fans turn on but the monitor cannot detect a video source.