On Fri, 24 Jan 2014 21:44:01 +0000, scott
wrote:

Thank you everyone for your suggestions. I hired someone, and he couldn't
get it down either. He thinks caulk got in and made everything stick. (The
last owners caulked the canopy to the ceiling, it got on the screws too
which I finally got out.) He's bringing a crowbar on Monday.

mmm'kay

You hire a guy that cannot defeat a caulk bead, but you will not give
us a make and model of the fan.

If the crowbar fails to work on Monday; try Thermite. LOL