I purchased a Late 2005 DP 2.3 and a 2.0 some time ago. The 2.0 came in first so i began using that one. Then my 2.3 came in so I just swapped hard drives. All worked fairly well, minus the extremely loud fans during sleep. So I just scrapped my whole plan of going old school......... Until now. I stuck a hard drive in my 2.0DP and tried installing Leopard from a burned disc image. All went well partitioning but when it got down to halfway through the install process it said something about not being able to install essentials package... I read and read and read some more about needing to pull all ram except for original amount... Tried it and the same thing happened. I then thought maybe my superdrive was going out because during the final moments before telling me it couldn't install the essentials package the DVD would spin up then stop, spin up then stop and so on for a minute or so. So I hooked up a SATA dvd drive with some southern ingenuity and was able to hold option during startup and see the install dvd... But when I clicked on it it then went to apple logo and spinning gear and the fans revved up and then restart. So I swapped back to original DVD drive and the same thing now happens each and everytime. I can no longer get it to boot into the install disc. Please HELP!!! seriously any help would be AWESOME!