My USB keyboard suddenly stops working. When it does, I can see the block num light sign twinkling, like if it was losing power. I also noticed that the LAN light indicator on my cablemodem also starts twinkling, even if no application is using the internet.
I tried updating the motherboard BIOS but the problem continues. I used a PS2 adapter and the same thing happens. I'm desperated.
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If your keyboard is a laptop keyboard then you have probably press the Num Lock key on. There will be a LED light indicating the Num Lock key has been pressed. In most laptops the ScrLk key also doubles up as the NumLock key.
You're "stuck" -- if the circuitry for the PS/2 keyboard and mouse is not working, and if it does not recognize a USB keyboard, the motherboard must be replaced (by an identical moetherboard, if you can find one, or a "newer/better" motherboard that takes the same CPU and RAM as your current motherboard).
remove all RAM modules - system should beep when you switch it on. If not then your CPU is not working.
Can you see anything on the monitor?
Does the keyboard lights flash when you switch on after several seconds (caps lock, num lock, scroll lock lights flash)
Slim, Other than saying well it was a good couple years for the board lets just verify: Have you tried a different keyboard? Check device manager and see if you uninstall the keyboard and then reinstall it.
Or have you recently installed any new devices that may have taken the resources away from the keyboard plug? If not get a usb keyboard and make sure you info is backed up...just in case.