I just recently built a PC and it worked great. The monitor worked fine and displayed the screen with all the specs and stuff because I didn't have windows 10 at the time. I just got the windows 10 USB in the mail today as well as a GPU because they were previously out of stock. I put in the GPU and we quickly saw something wasn't right because the PC wasn't turning on at all. After changing the cable, the PC turned on but the monitor displayed no signal. We tried everything and the monitor still said no signal. We gave up and ended up taking out the graphics card so the monitor would work. But even after taking out the graphics card, the monitor still read 'No Signal'. What do I do?