Hi Cait

If you have the recovery tool on a USB thumb drive, just insert the drive, and 
when you boot the system hold down the option key.  Give it 10/20 seconds, then 
hit the left/right cursor key once and press Enter.  This should cause your 
machine to boot from the thumb drive and give you the options.  I strongly 
suggest that, in the first table of options, you select Disk Utility and then 
re-partition your hard drive.  Be sure to select "Mac OS X (Journaled)" from 
the list of options.  Then in the "Options" section, select "GUID" partition 
type, click Apply, then click Partition.

Once done, then you can proceed to the install as normal.

This is a problem which I've only seen once in over 7 years of Mac usage.  I 
honestly can't remember whether this indicates a hardware problem or a software 
one.  I thick it was software, and I hope it was.

Gordon


On 4 Sep 2012, at 19:38, Cait Furness <[email protected]> wrote:

Ok, Gordon, that's what I was beginning to suspect.  I've already done a repair 
permissions twice.

I'm running mountain lion now, how would I go about reinstalling it from 
scratch, please?  Mark made us a usb stick with ml on it and I am now putting 
all my important stuff on my back up drives so I can do everything cleanly.

thanks,
Cait

On 2012-09-04, at 2:05 PM, Gordon Smith <[email protected]> wrote:

> Hi Cait
> 
> This sounds like a pretty nasty systemic permissions issue.  I really would 
> suggest that you back up everything important on to external media as quickly 
> as you can. You may well end up having to reinstall from scratch, or from a 
> backup.
> 
> Gordon
> 
> On 4 Sep 2012, at 18:59, Cait Furness <[email protected]> wrote:
> 
> Hi,
> Lately whenever I try to delete items from the trash in mail, on my mac as a 
> whole, or whenever I try to move items from my external drive onto my hard 
> disk, I get a dialog which says the operation can't be completed and it's an 
> error -50 and an ok button.  How do I fix this, please?
> 
> thanks,
> Caitlyn
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