F keys , arrows , backspace , shift keys all not working on the wireless keyboard on imac 2009 with yosemite
the keyboard suddenly isn't working right after i did the latest update,i tried reinstalling yosemite but with no use , the keyboard F keys aren't working so no volume or brightness control, plus the arrow keys are also with no function and the shift key is also not working so does the backspace which delete in the wrong direction.please help
iMac, OS X Yosemite (10.10.4)