When booting up, the bluetooth connects and then disconnects with my trackpad 3 or 4 times then i get a gray cover over the desktop that drops from top to bottom then a window that tells me to use the power button to do a forced shutdown.

when booting up, the bluetooth connects and disconnects with my trackpad 3 to 4 times and then i get a gray sheet that drops down from the top to bottom of the desktop then a box in the center that tells me to use the power button to do a forced shutdown. wireless keyboard connects with no problem. went to the apple store and they replaced the bluetooth card. still have the same problem. removed the batteries from the trackpad, strted up and no problem connecting with wireless mouse and keyboard. anyone else experience this?

This could be a software/state problem or a hardware problem.  Here are steps to resolve the former.
http://support.apple.com/kb/TS2570
https://discussions.apple.com/docs/DOC-5282

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