So I'm having a problem with my Mac Pro 1,1 and my recently purchased OWC Mercury Extreme Pro 6G 240GB drive. I installed the drive via the NewerTech AdaptaDrive 2.5" to 3.5" Drive Converter Bracket into one of the regular SATA II hard drive bays. For the first few days the drive worked fine, then yesterday the following happened: turned on machine and machine won't boot up -- doesn't get past initial gray screen. I reset the PRAM and the machine boots, but it does so to my old hard drive. When the machine finished booting, the SSD was not recognized in the Finder or Disk Utility. It's as if the SSD weren't even installed. Powered down machine, opened it up, removed SSD and plugged it back in. Powered machine back on. Now the SSD is mysteriously back and works fine again This morning a similar thing happened, only this time it was when waking the computer from sleep. Upon wakeup almost nothing worked (couldn't launch applications, for example) as if the drive were absent. Upon restart I followed the same numbered steps outlined above and it is once again working fine. So I'm assuming that I just need to return the drive and the converter bracket. But my experience is so bizarre that I wanted to see if anything similar had happened to anyone else, and if so if there were anything else I could do.