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Sounds like it's either the motherboard or you may need a new bezel.
Another solution that may be cheaper would be to reinstall the operating system. Or do a factory image recovery and see if it's a software issue. First check the device manager to see if there is an obvious driver issue. If not try reinstalling Windows 7.
If that doesn't work then replace the bezel.
If that doesn't work then replace the motherboard.
The most probable causes of this problem is that the receiver which is connected to the CPU or it is already broken. Try to check all your connection (of your wireless keyboard and mouse) replug it then restart your computer. If still don't work, it is already broken.
Unplug the wireless receiver from the back of the computer. Wait 10 seconds and replug back in. Check connectivity. If nothing then check batteries in mouse, if still nothing try click the Connect button on the wireless receiever and then underneath the keyboard...repaet the process for the mouse. You should get something on the screen stating the channel 1 is for the keyboard and channel 2 is for the mouse. Hope this helps! - Erick :-)
1st, I know it sounds silly, but please make sure the new batteries you installed are new and fresh. Even if they were not used prior, if they are aged, they can still not have enough energy to power the transmitter in the keyboard.
2nd, once you are sure that the battery situation is ok. there is a "link" button on BOTH the keyboard AND the receiver ( the usb piece ).
Press the link button on the receiver 1ST, (usually it will start blinking to show it is in a search mode), then while it is flashing, press the link button on the keyboard.
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