I have my iMac configured to require entering UserID and password for access. The batteries in my wireless keyboard died, so I replaced them. Now, as I try to use my iMac, I get the security login window. UserID is pre-populated, but I can't enter my password because my keyboard isn't re-pairing post-battery replacement. I get green lights flashing on my keyboard, but no luck in terms of repairing. I've tried powering down the computer, but no luck.
Any advice?