Hello, my keyboard was working fine last night and this morning....nothing. when i unplug and plug back in, the light on the keyboard will flash for a second and go back out again, but that is all.
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Did you unplug/plug with the computer running? If it's a PS2 keyboard, that's a good way to short out the PS/2 port. Try turning your computer, check the keyboard connection (make sure there are no bent pins) and turn it back on.
Try anotherkeyboard. As Grumpy said, switch off before plugging/unplugging it.
If it's a USB keyboard just unplug it and don't use it for a few days(frankly it worked for me)