On Dec 16, 2008, at 2:50 PM, Wilton Shaw wrote:

> One of the reasons given is it will not mount because of "invalid  
> checksum", whatever that is?

This means the downloaded disk image file is corrupted. The checksum  
is a sum calculated in a specific way such that if any single bit has  
been changed the sum will be different. When this is "invalid" it  
means the sum is not identical to the sum of the original file.

You'll need to download the entire file again. If you get this twice,  
your HD may be going bad.

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