[rescue] Mac diagnosis

Kirill Levchenko kirill at lava.net
Tue Mar 9 22:36:59 CST 2004

On Tuesday, March 9, 2004, at 05:41  PM, Phil Stracchino wrote:

> So:  Any speculations on what's dead?  Blown video?  Dead motherboard?
> Zapped ROM?  I'm assuming either of the latter would preclude the 
> chime.

The fact that you hear a chime indicates that the CPU (and some 
memory?) is okay, since I believe it takes the CPU to make the chime. 
Try holding down


when rebooting. (The command key is the one with the apple) This resets 
the PRAM. If that does not work: You may have a damaged the monitor or 
the video card. Try restarting while holding down


which places you in OpenFirmware, after doing system checks. You won't 
see anything if your video is dead, but after some time (30 sec), type 
"reset-all" and press enter. This should restart the machine, and you 
should hear a chime, which will indicate that it *is* just the video 
that is dead.

If this is the case, and you determine that you've damaged the on-board 
video by trying another monitor, then the computer is still useable. 
You can use another video card, or use it headless via serial console.


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