Anyone knows what do do when iMac doesn't recognize any USB or Bluetooth?

Hello,
if anyone can help, please. my iMac does not recognize anything I plug into the USB ports in the back. I can't use any keyboard or mouse or track pad. It does not recognize any bluetooth such as magic mouse, wireless keyboard or track pad. When I plug in an older keyboard or mouse it does not see it at all either. don't know what to do. Can't do anything on the computer, which otherwise seems to be working fine, except everything I was using is frozen on the desktop. any advise?

Zap the PRAM and Reset the SMC, then try again.

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