Hi could someone help. We have an optiplex 780 and when starting up the mouse and keyboard will light up but then no longer works anymore. Tried other keyboard and mouse and it does the same thing. Can't go into reboot or anything cause no keyboard will work. Please help
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I had a few 780 before. Did you try all the USB ports at back and front to see if issue persists (there are 5 at back and 2 at front)? Did you see an error of "keyboard not detected" on boot screen? It sounds like your keyboard got some power if some light was up. You only need the keyboard to test if boot responds to key stroke.