Really stuck with this one. Can anyone advise please? 1. I was given a MacBook Pro with OS X 10.6 installed in such a way that it would not allow me to install new software on the machine. 2. I wanted to do a fresh install of Snow Leopard to start using the machine from scratch. 3. (Mistake stage?) ...I then: (i) connected the MacBook Pro to another Mac; (ii) booted the MacBook Pro up in firewire target disk mode (held down 'T'=key while switching it on); (iii) opened Disk Utility on the host Mac and selected 'Erase Disk' for the target MacBook Pro, to wipe tat clean before installing Snow Leopard. 4. I shut everything down, disconnected everything and then tried to boot the MacBook Pro up from the Snow Leopard install disc (holding down the 'C'-key while the machine turned on). The computer stayed in grey screen mode with just a picture of the apple in the middle of the screen. It will not read and boot up from the Snow Leopard disc. 5. I connected the MacBook Pro in firewire target disk mode to another computer and managed to install Snow Leopard onto the MacBook Pro from the other computer. Software seemed to install on the MacBook Pro OK remotely. 6. Again, when I try to boot up the MacBook Pro on its own, it stays on grey screen with just the apple logo on it. The installed software is not starting up on the MacBook Pro. Please can a clever person help me out and let me know what I should do? I am certain that the hardware is OK. Best wishes, F.