wireless comfort keyboard 5050 keys are not works

[Hossam Mahmoud_14]

I have wireless comfort keyboard 5050 for almost 3 years and i didn't use the keyboard for almost a year but i used the mouse without any problems "all that time i removed the battery from keyboard", Now i trying to use the keyboard again but it didn't responding.I used a working battery the power led is on and F keys working and the bar above F keys is working too, while all other keys doesn't work.

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