We have tried the hdmi, dvi, and display ports on our graphics card and none are putting out an image to any monitor we try. The mouse, which is connected to the motherboard, is lit up and appears to have power. But our keyboard, which is connected beside the mouse and also to the motherboard, doesn't seem to be receiving anything. We've changed surge protectors and various cords, but nothing is working. We've also opened the tower and gave it a good cleaning to see if that was the issue.

This all started yesterday. It had been working fine in the morning, then when we went to use it that evening this happened. No power surges have happened and all the cords are intact.

Unfortunately, the people who helped us build it are no longer able to be contacted, so we're sort of on our own here and very confused.