Hello there. First time caller, as they say. Basically, the guys at the Apple store said the hard drive on my 2008 entry-level Mac book had died so I went out and bought a new one from Western Digital. But when reinstalling, the screen froze on 'verifying destination volume', then packs up and suggests I start again. Searching this forum I see that others have had this problem and that one solution is to perform a 'clean install'. My question is, how do I go about doing that? Many thanks in advance for your help. BNM.