When I first built my PC a little over a month ago, it had no signs of life. I tried just about everything, and didn't know what to do. I recently found out that my CPU was faulty and that it had damaged my motherboard, and got them both replaced. After rebuilding it, my hopes were high as the PC lit up and all the fans turned on. The only problem was that once I tried plugging it in to a monitor, there was no signal. I tried using both a VGA and HDMI cable plugged into both the motherboard and the video card with no luck, as well as resetting the CMOS battery, reseating the ram and putting the ram in different slots. I also tested the monitor with another computer (it worked) and tried using a different monitor. I also noticed that when I plugged in a mouse it lit up. The video card fans spin for a little bit once I turn the PC on and soon just turn off (I assume this is just due to it not being used). I have also tried a few other solutions I found online such as unplugging the PC and then pressing the power button for ~1 minute. Finally, I thought it would be worth noting that I have 3 fans plugged into the motherboard and 1 into the PSU (I saw someone in another threads problem be linked to this).