I replaced the 80 GB drive with a new 500 GB drive, but when I restart from the OS CD, the computer doesn't see the new drive. It doesn't show up on the disk utility application, so I guess it's not just in need of formatting. The Mini is a 2008 vintage core two duo, 1,83 GHz, and the new drive is a Western Digital serial ATA 56400 rpm WD500BEVTSP. Any suggestions for debugging this problem would be greatly appreciated. MacDriver Maybe I should add, after this happened I re-installed the old drive, and it worked fine, but when I de-re-installed the old drive and re-installed the new drive, it still doesn't show up in disk utilities or system profiler... is it a dead drive?