rsolberg said:

This sounds consistent with how my Performa 6360 behaved with a dead PRAM battery. Pressing the keyboard button would usually power on, but not always boot the machine- particularly if was disconnected from mains power since the last boot. The case power button would work reliably, though. Maybe it would be worth cleaning the battery holder contacts just to be safe.

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I find with my 9600 aside from the usual 9600 double boot quirk, when i has a crap or no PRAM battery, the front power button tends to be a little temperamental and require a few presses to get it to work. Power key will always start it though, and once it has been powered on with the power key i can do the on-off on thing with the button just fine. Only seems to be with a dead or missing battery that it does this.