You won't do it without breaking it and you're not going to find an
aftermarket heatsink and fan. If it's because the fan has failed,
you're better off finding a fan that's the same size.
--
Conor
I only please one person per day. Today is not your day. Tomorrow isn't
looking good either. - Scott Adams
Thanks to everyone for the responses.
I had quite an adventure.
Got heatsink off and found I had a removable chip.
Put chip back on and then monitor would not work.
I re-inserted RAM.
I cleaned up old heatsink paste and put on new.
Re-started computer and BIOS would only "halfway" complete.
Oops, I had forgotten to put heatsink on.
Ending: Things are running fine.
I give high marks to Dell for building in safety features for their
Optiplex G110.
Andy