iMac G5 displaying "You must restart your computer" message at startup?

Hi there, hope you can help.

Each time I start up my G5, the apple gets displayed and the notched "clock face" starts to spin, but then the screen goes a dark grey and I get a message saying "You must restart your computer" in three languages.

Things I've already tried
1) Using an external drive to start up from
2) erasing/reformatting the internal hard drive and reinstalling the OS

The same error message pops up when I choose to restart off the external drive if I do an option + start up.

The same error message pops up when reinstalling the OS when it reaches the of the install Disk 1 and it automatically restarts.

iMac G5 Mac OS X (10.4.2)

Posted on Nov 28, 2006 2:14 AM

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iMac G5 displaying "You must restart your computer" message at startup?

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