This Canon 40D has been in the closet for 3-4 years...stored in a camera bag...with no battery or card in it. I tried...

Thanks! I found the date/time battery and put a new one in, but it didn’t help. So I put the old one back in, thinking the body was done for. But the next day I tried another new BP511 battery and it started working! Then it also worked on a second BP511 battery! Who knows what’s going on! One other thing is the exposure compensation feature doesn’t seem to be working….it’s set on -2/3 f stop and I can’t get it to change. Any ideas?