[rescue] Mac diagnosis
alaric at caerllewys.net
Tue Mar 9 23:04:55 CST 2004
On Tue, Mar 09, 2004 at 08:36:59PM -0800, Kirill Levchenko wrote:
> 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
> 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
OK, I thought I remembered that one. It's a heck of an endeavor trying
to get all those four keys AND hit the power key. When's the critical
time for PRAM reset? It's the first five seconds after power-on, right?
And IIRC, it *should* reboot and chime again after resetting the PRAM?
> 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
This one I didn't know about, and will try it. What's the earliest Mac
model that has OpenFirmware?
> 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.
I'll try that.
> 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.
Should a PCI Mac be able to use just any PCI video card? If so, I have
a number of spares around of various types (a couple of S3 Trio64Vs
and a Matrox Millennium II).
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