Recently my Gigabye 560 GTX ti stopped sending a signal to my monitor. To check to see if the issue was with the monitor, I placed a MSI GTX 260 and tried to see if a signal would be sent to the monitor, it did not. Suspecting the issue may be the power supply, I cleaned it out and then started up the computer and it was clear the motherboard as well as the graphics card was still receiving power (the graphics card fan was on). As of now my computer starts up but my display does not receive a signal from either graphics card. My onboard graphics card is also not sending a signal to my monitor, so when my computer boots up there is no display. I suspect the issue may be the mother board, but with seemingly all other things functioning I am not sure. How should I proceed? thank you for your help.