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G4 400, no startup
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Junior Member
Join Date: Mar 2001
Location: top 3%
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We have a G4 400 here at my office that boots into open firmware. When we power the box on, we get a long tone, then the normal startup sound after a few seconds, then the machine goes right into open firmware. When we do a mac-boot, it hangs at an all grey screen.
We've replaced the memory, zapped the pram, reset the PMU, unplugged the drives, and tried to boot off of a CD(with the drives plugged in of course). Nothing is working.
Has anyone seen anything like this? It's driving us crazy! 
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Registered User
Join Date: Apr 2000
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Is it a Yikes!, a Sawtooth or a Mystic?
These machines have no PMU reset. Do you mean the CUDA P/NVRAM reset?
How did you reset the PRAM? Keyboard? Cuda? Open Firmware?
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Fresh-Faced Recruit
Join Date: Dec 2001
Location: Chicago
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How about the battery? In late model the CPU would hang up in the boot stage.
Tom
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Junior Member
Join Date: Mar 2001
Location: top 3%
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the machine is a Sawtooth, and we did remove the battery and reseat the CPU and still the problem persisted. Then it hit me, the long tone that it plays on startup is the same long tone when you update the firmware and boot holding the interrupt switch. On a whim we took the front panel assembly (on w/led, reset, interrupt) from my G4 500 and put it in the G4 400 and it booted no problem.
It seems that the interrupt switch is shorted or the whole assembly is bad. Thanks for everyone's help.
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Fresh-Faced Recruit
Join Date: Sep 2000
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I actually have this problem and using a simple switch to the power pins did not seem to help...I wonder if I use a replacement front panel board, if that will help...hopefully it will...thanks for the idea 
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Fresh-Faced Recruit
Join Date: Sep 2000
Status:
Offline
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Didn't work for me...tried using an old iMac keyboard to test whether there was a problem with the pins on the board...seems to be a bootROM problem, although the Apple Hardware Test tells me its fine...I could just set an nvscript to boot into Mac OS but I don't think of that as a solution:/
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