The old computer's hard drive at our local Humane Society failed, so we opted for a rebuilt from our local computer shop in order to save money; we simply can't afford to buy all new software for a new computer. The replacement is a Dell, running Windows Vista, and it has only USB ports.
It would not respond to the USB keyboard that came with it; we had to haul it on back to the shop. There, we tried a different keyboard and it worked. That was about 45 days ago.
Yesterday, we moved some stuff around, and again all of a sudden the computer is not recognizing the keyboard. All the USB ports are active; we determined this by plugging the mouse into each one. The mouse lights up and responds. I went to "Control Panel > hardware > USB wired keyboard and Windows Vista did not detect any problems. We don't get any kind of error code; we simply can't type anything in. (I am typing this request from my computer at home.)
I know this issue has probably been addressed here before -- but I simply don't have time to browse through thousands of posts by the keyword "keyboard." So how do we fix this? Thanks in advance.