Hello Carrie, (1) have you had a look onto the jumpers? If the harddisk is slave for example and the DVD too, you will have problems. (2) Maybe the cube has a wrong firmware to boot with OS-X. Have look onto Apple support site- These are the main possible reasons. Can you start the cube with an OS-X DVD via DVD-start? If not, that might be the firmware issue. If yes, that speaks for the HD-problem (jumper) - I would mean that's might be the main reason. Of course the HD can be simply defect? Try to start from an external or the internal DVD with OS-X or OS 9 and with the specific HD in an external FW-enclosure. Will it be recognized then? The FW-externals are not specific with the jumpers as far as I know. Good luck Stefan >Hello, > This is my first posting. I purchased this >cube off of ebay. I am trying to get this up & >running but have hit a major snag. It just won't >"see" the hard drive. It had everything deleted >by the seller. The unit sees the external >firewire disc drive & boots it with a OSX disc, >but still doesn't find the HD to install it to, >not sure if it sees it's own internal drive. I >have I thought properly reformatted the hard >drive useing another cube, but it still doesn't >see it. My next options I think are reformatting >a hd in another cube, swapping the disc drive >from another cube, any thoughts out there? Much >appreciated. Kindest Regards, Carrie in >Chicago,IL