Pismo won't startup without resetting PMU

Hi
I have a 400MHz G3 powerbook with 256MB RAM running Mac OS 10.3.9 very successfully. My problem is that if I shut it down it won't complete startup again unless i reset the pmu (holding down the reset button on the back panel for 3 secs) every time. It does the chime but the screen doesn't come on. The main battery is good (it lasts 2 hours or so) and as far as i can tell the PRAM battery is good too (i tested the voltage across it and it reads 6.77 volts or 3.39 volts depending which of the 3 connections you read). I tried charging the PRAM battery without the main battery installed and it didn't go up at all so i assume it's fully charged.
Anything else i could try?
thanks

mrbump,
There are two or three hardware components that can cause this issue:
- The most common is a failed backside L2 cache. When booted to 10.3.9, see if the System Profiler reports 1MB of cache. If you have a bootable 9.x CD or 9.x on the HD, first shut down, then boot to 9.x. If there is a problem with L2 cache, you will get a dialogue during startup; this test does not run through a restart.
- The other two possibilities are a bad CPU or logic board and I do not know how to determine this.
If you have your Hardware Test CD that came with new Pismos, give it a run.

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~~~~~~~~~~~~~
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