On Jul 30, 2004, at 1:42 PM, Alejandro wrote:
Check this. With powerbook attached to the AC Adapter (no battery), press the start button, and you should hear a little "contact" sound at the same time the Start button is pressed (before the Startup sound). If you don't maybe the machine is not powered at all.
You are right in that the machine is not getting power to where it needs to go.
However, it doesn't seem like the Battery Board, and since power is not getting anywhere (entire machine is cold after pressing the power button), that would leave the logic board, correct? What I am trying to do is figure out what components would cause the Pismo to remain cold dead with both a fully charged battery, and an AC power source.
First and easiest thing to check is the RAM. I've seen a few Pismos refuse to boot because they had a stick of bad ram. If that's not it, try a different processor (assuming you've also checked it's not that the processor isn't fully seated on the logic board).
Well, if it is a bad stick of RAM, there should be something happening. HD noise, a light, the normal speaker 'click', the beeps of the self-diagnostic, something. Bad RAM doesn't stop power from flowing like this.
On Jul 30, 2004, at 6:48 AM, Mikael Byström wrote:
Are you sure the Soundcard gives power to the I/O board? This was the reason in a dead Pismo I dissected recently.
The good news is that I already tested with a battery and eliminated this as a possibility... unless the AC board has magical powers to prevent a boot from a battery, which doesn't seem entirely likely.
What I am trying to do here is figure out if it is the Logic Board, Processor card, or battery board that could cause a completely cold, dead, lifeless Pismo. It is as if it is a door-stop.
Regards, Adam Thayer
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