I am not able to use my keyboard, the three lights : num lock, caps lock and scroll lock keep on flashing on and off. I tried the keyboard on another PC and it worked there. Does anyone know what the problem is , since the failure of keyboard is disabling me from using my PC.By the way my keyboard is not connected through a USB port. Thank you all in advance.
The contacts inside are delicate and probably became bent or may just be dirty as had been said. Buying a new keyboard probably wont help as it is a problem with the contacts on the PC. Since you get lights occasionally that means there is some connection there and you may be able to rig it to be used but that is a pain. The best solution may simply be to get a ps2 to USB adapter for your keyboard, and use it via usb(doesn't always work) or simply buy a usb keyboard. Unfortunately I've seen this problem many times and it creates a pretty nasty catch22 situation. Typcially a usb keyboard wont work in the dos level unless you can get into bios and set it to use a USB keyboard, but even worse, the bios by default most likely will not detect the USB keyboard, and will report an error that no keyboard is found and you must hit f1 to continue or delete to enter bios. Well you can't do either of those with the USB keyboard and since it is impossible to use a ps/2 keyboard, you become unable to use your pc because you can't get past the error message. Because of all of this, I would recommend trying to get your motherboard replaced under warranty if you can. If you are not able to, then you might want to try a USB keyboard and see if you get lucky and your bios is not set to halt on errors.
if your keyboard works on a different computer then your computer is the problem. I would say that either the driver is corrupted, you have a virus, or your keyboard port has gone bad.
The female port on you computer might being bad or simply has a dirty contacts. Make sure your computer is powered off. Buy some contact cleaner or carefully put some alcohol on the plug of the keyboard and stick in the female socket on your computer. While its still wet push it in and out. Then blow on the female side to make sure its all dried out. Power up and see if its still bad. Or .buy a new keyboard.
try a system restore -start, all programs, accessories, system tools, system restore its probably a virus
