Have had a LaCie 1TB external hard drive running on my iMac running Mac OS X v. 10.5.8 for several months using USB 2.0. Had no initial problems but about a month ago, whenever I tried to turn the drive on, it would open three or four of the partitions before simply powering down. I would then get a device removal warning.

The hard drive works without a problem on my brothers MacBook Pro so Im not sure the hardware is the problem.

Does anyone have any ideas for a solution?