What is wrong with a wireless mouse

[marian C]

Hello,
I have a wireless mouse on my computer that I have not use for a while and now the wireless keyboard and mouse will not work. I have checked the batteries.

 

[krizpy86]

If you have old batteries in any device they can corrode. If there has been any corrosion happening in there (crusty yellowish white powder) then there may be a ground issue. Using good lighting inspect the contacts and if there appear to be any corrosion clean it up with a knife or some electrical contact cleaner. Is the set bluetooth? Have you changed computers or anything like that?