Good morning-<br />Yesterday while shooting a wedding, I got an "Error 50" on my EOS 50D camera. The following is what happened prior to the message:<br />- About 20 shots prior to the message, my partner inserted a Lexar 8 gb CF card that was giving him an error on his camera ("Error CF" on a 30D) We tried it on my camera and it said "card full". The card was nowhere near full but displayed the message.<br />- I was using a Tamron 18-50 2.8 lens then switched to a Canon 10-20 lens. Got about 5 shots on that lens and then the "Error 50" message.<br />- Camera is completely locked. You can hear what sounds to be the shutter moving everytime you open the battery hatch, the CF hatch, and when you remove the lens.<br /><br />After spending time researching the web for solutions, the following is what I have tried:<br />- removed and reinstalled battery, lens, CF card, even the tiny dime size battery<br />- cleaned the connections with alcohol/q-tip<br />- tried different lenses, batteries, battery grips, no CF card, hooking up to computer for remote use<br />- everything is disconnected to it now (after some needed sleep)<br /><br />I'm afraid that I will need to send to Canon but I thought I'd post here first. Any help would be greatly appreciated! Thank you so much.