I have tried troubleshooting, searching this forum, & googling to no avail. I'm hoping someone smarter than me can figure this out. Short Version: Purchased this hard drive: http://www.newegg.com/Product/Product.aspx?Item=N82E16822148073 and purchased this external enclosure: http://www.meritline.com/usb-hard-disk-enclosure-black-25---p-22596.aspx when I plug it into my macbook, PC, or a powerbook, the disk is not recgonized, I can not get Disk Utility to even recognize that the hard drive exists. I thought it may be a bad drive, so I sent it in to Seagate Warrenty, they sent me a new one and I'm still having the same problem. Does anyone know how I can format the drive or any way I can get it to be recognized? Longer Version: My powerbook crashed, so I purchased this HD to replace it. I installed the 1st seagate and when i went to install OSX and said select destination drive, there was none there to select. I was able to repair the original HD so I reinstalled it and went to install OSX and it DID show the drive to install it on, so I don't think that it is the computer/motherboard. Then I sent in for the 2nd seagate, tried getting it to work with the external enclosure and installing internally in the powerbook, etc. nothing seemed to work. I am wanting to install the new drive in the powerbook as the old drive is on its last leg (but currently works). Every thread i have searched for that was similar, there was no solution that I could use. Thank you for any help.