The past couple weeks my mac pro has been having problems waking up from sleep. It would also crash when encoding anything longer than 1 hour with Compressor. I didn't know what to think until yesterday when only 1 GB of RAM showed up in the OS instead of the 2 GBs installed! I popped off the side and one of the RAM lights was red. After switching the modules around to different sockets I knew it was the module. Took it to the Apple store and they will be replacing the module. Has anyone else had an Apple module die on them?