imac

My Imac had been working fine, but lately from last 1 week when i restarted my iMac i see on screen my user name, other and on the bottom of screen icons for shutdown restart and sleep

My keyboard beeps when i pres TAB key or return keys. my magic mouse is not responsive. So help me to login or do anything on my iMac.

I have connected my magic keyboard and magic mouse to windows laptop and they seem to work fine.