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restart your computer repeatedly tapping the f8 key to enter safe mode while the screen is black once in safe mode where the only things working will be your keyboard and mouse allowing you to attempt to repair your computer you might use the system restore to restore your system to an earlier time click start all programs accessories system tools you should see your system restore option hope this helps you
if this just happened, it may have to turn off the laptop, remove the battery and adapter, then press and hold the power button for about 10 secs to discharge residual power, then reconnect the power sources and test the keyboard again. If this did not work, confirm if an external keyboard is working. If no issues with an external keyboard, you may try to remove and reconnect the keyboard cable connection to the motherboard, make sure none of the keys are stuck, and if nothing works, you may have to get a replacement for it.
unhook the receiver and hook it back up to the computer and see if the computer redetects it. Either way if the light comes on try to sync it again with the keyboard and mouse. If it doesn't sync up with both the keyboard and mouse then the receiver is bad, if it syncs up with the mouse and its working and the keyboard but the keyboard is still not working, then the keyboard is defective and would need to be replaced.
If it is still dormant after you power everything down, you probably have not mistakenly hit something. There may be something physically wrong with the key. Try the keyboard on another computer. If the enter key works reliably there, you have quite a puzzle. But if it fails there as well, see whether the enter key moves as smoothly as the other keys. If it is a larger key, it may have an "equlaizer bar" to make it move smoothly that may have become detached. In that case, look at similar keys to figure out how to reassemble it properly. Also look for dirt of any kind under it or between it and nearby keys.
This is a system board POST/BIOS error code (nothing todo with Windows). The ERROR 210: is a standard POST (Power On Self Test) errormessage that indicates an error with the keyboard. The error condition is thata keyboard scan code was received from the keyboard when none was expected,after the keyboard was reset.
If this occurs most of the time when you power on yoursystem, then it indicates that a key is sticking down or the key mechanical orelectrical parts are broken. Sometimes blowing out and cleaning out around thekeys will resolve this problem. Otherwise, you need to replace your keyboardwith a new (or at least a working) one.
Make sure the power is completely off. Turn the power back on. Try using Esc key, F1, or the delete key. If you press the wrong key, it will give yoiu a keyboard error indicating an option to press the correct key. I'm pretty sure one of those keys will work on an emachine.
Solution. My wireles keyboard stopped working except for the F-Lock key, the Media key and the sleep key. It wasn't batteries, even though I tried, communication was there because the above keys were working. Remove the batteries from your keyboard and let it sit for about 10 minutes. Press the red connect button a few times and other various keys every few minutes during that time. This may be the whole "capacitor discharge" trick, but I tired that with someone elses instructions and my keyboard did not work after 2 minutes of key pressing. I think it just needed more time to clear out the secure settings. Good luck, I was about to trash this keyboard until I tried again