Black screen, but have power

I am working on a desktop that displays a black screen when turned on. The monitor goes from no signal to having a signal when it is turned on. I have tried reseting the cmos by taking out the battery and also by using the jumper. I have also tried removing deviceso to where I only had the monitor, power button, and psu 24pin connector attached with the same result. I have also tried adding an external graphics card.

I did make a little progress by resetting the cmos. I reset it and then turned it on and I got to the windows login screen. I figured it was fixed and I cleaned the inside of the computer and tried turning it on again and had the black screeen. So I tried reseting the CMOS again and it didn't work this time. I even took the battery out, unplugged the psu, held the power button down, and moved the jumper. I had the jumper and battery removed for around 24 hours. Now I am having no luck.

Does this sound like a motherboard issue? I tested the psu and they all came up good.