No video signal
This is my first time here, so please bear with me. I pulled my usb mouse out of the computer to replace the son's mouse. When returning with that mouse to see if I could get it going, my computer would not respond. Rebooted and now get "video input. No signal". Prior to this, we changed the power settings to shut down the hard drive after a spell(don't know exact timings, sorry). I've tried the monitor on another computer and get the same thing. I've reset the cmos and pulled the battery, reseated all cords and cables... Any help? It is a Gateway desktop, there are also 2 short beeps followed by 6 short when powering on. The mother board and fans work.