Mac Blackouts are usually hardware related and often usb related. If  
the dead usb port is not shorting check to see if it is damaged.
USB's die from usb female plugs being forced in reversed. It can be  
done..... you may want to desolder the outlet.
Run the mac on a separate account with minimal add-ons - this should  
prove stable if not

Double click on all hard discs - if they do not respond immediately  
check that "sleep hard discs" is off and check again... a drive may  
be on its way out.
Then check ram - by softcheck if u have the software like tech tool,  
else remove most starting with minimum ram.
Check by replacing external usb / fw cables.

Cheers geoff b

On 06 Jul 2009, at 3:00 AM, Jonas Ulrich wrote:

> My friends 1GHZ MDD isn't working. First safari randomly quits. So  
> I did all the updates and installed safari 4. So Safari seems to be  
> working and I'm downloading something and the crash thing comes up  
> and says "You need to restart your computer. Hold down the power  
> button for several seconds or press the restart button." It has  
> plenty of ram to run Tiger. 1.38GB. One thing that I noticed is  
> that one of the built in USB ports completely doesn't work. Any ideas?
>
> -Jonas
>
> >


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