iMac 21in Maverick suddenly comes on mouse and keyboard not responding

SOLVED !! ?

Left computer off  24 hours- restart - still unable to sign in - 

Bluetooth message appeared - can’t find keyboard - therefore unable to type pw

I tried using as Guest ( no sign-in needed ) -message disappeared at first  then returned = ’no keyboard connection ’ .

I moved the keyboard away from the computer and touched keys and suddenly heard beep when touching keys ?

But still didn’t work and same ‘ no connection’ message.

I’ll skip most  details - 

Opened System Preferences for BT = Devices 

found Keyboard not connected and something about MacBook connection. ?

It seems I may have tried to connect MBook computer to the IMac through BT which possibly caused problem ?

I was able to force quit BT.

I turned on the keyboard connection and turned off the ‘computer’ connection.

( then also make sure top right BT  is ‘On’ 

and devices connected = keyboard and mouse ).

It seems this was caused by glitch when I was messing with ‘connections’ for ‘computer sharing’ with BT. I’ve turned that off.

I also turned off BT on MBook (it doesn’t have any BT devices - and may have been messing with iMac BT ? ). Keyboard now working fine .

I’m still trying to figure out Keychain and Time Machine and fix the mail - on and on but the Mouse and Keyboard are 'playing' again !

Eric, thanks for reply, although I was able to 'solve' without using 'wired devices' ...

I'm familiar with resetting "PRAM" (used as a 'clean up' needed or not) and should

have thought of that as computer had been unused long time,

but I've never heard of "NVRAM" ?

Thanks for 'resetting my memory' !

darn, not able to 'edit' my reply to you = Eric

I should have mentioned 'detail' that before I restarted I removed "Passport"

for Time Machine ( which had been unused when computer wasn't being used

but infrequently by me as Guest

so still 'on' - but the "Passport" had 'gone missing' and computer had begun

coming on for no known reason - I had continuous message about 'agent/keychain' permission....

also removed a 'thumb drive' that was being used at times . These were functioning to save files

as I attempted to figure out password(s) - so TM was 'working' here on and off then disappeared.

I've just reconnected it and figuring out what happened there over last year - just finished it's 'updating'.

so then, more to learn ! at least I can work on a problem that can be solved !!

Neil22R

Every little bite helps- re-learning all the time

Bites of confusion = ID, user name and Email all the same in one place,

different somewhere else = like on my old computer and new and Google,

and mail and YT and and ZOOM DR, and aaaagh

any wonder I can't change the keychain pw-

thanks for 'meaning and understanding' in tornado times !