Help! PowerBook Won't Power On and Start Up!!!

Hi All,
I’m hoping someone out there can help! My PowerBook G4 15 Inch (Original model) won’t start at all. When I push the power button, nothing happens. Nothing at all. No lights, no sounds, no fan, nothing. It was working fine when I put it away on a shelf in my closet about a year ago, but when I took it out to look up a document, I found that I couldn’t turn it on. It hasn’t been dropped, knocked, exposed to water, etc. It’s literally just been sitting on a shelf for about a year. Some information which may help:
1. It appears that the battery does not hold a charge anymore, because I left the laptop plugged in overnight and the indicator lights on the battery still do not light at all when the power status button on the battery is pressed. However, I don’t think this should affect startup when the AC adapter is plugged in – the PowerBook should start up regardless of the power status of the battery. (By the way, I know that the AC adapter is good because I tried it on a friend’s PowerBook and it works fine.)
2. I’ve already reset the PMU (several times) by pushing the little button on the rear of the PowerBook with the end of a paper clip. That doesn’t change anything either.
3. I’ve removed the battery and left the laptop plugged in for approximately 15 hours just in case the internal PRAM battery needed a charge after having been stored for so long. No luck there, either.
I can’t understand what could have happened to it just sitting on a shelf! I had another Mac laptop sitting right next to it for the same amount of time, and that one started up just fine. Does anyone have any ideas as to what the problem could be and a potential solution(s)?
Many many thanks in advance to anyone who can help!

Appler5 wrote:
it seems fairly cheap and easy to fix
Yes, which is why I'd tackle that first. My first suggestion would have been to try the power adapter with a meter or on another Mac or check, but you're a step ahead of me on that, so aside from a possible, but highly improbable death while resting on the shelf, the b.u./PRAM batt is the obvious issue.
I do hope that's what this turns out to be
Me too. It'd be worth it for your time and money, whereas other, major, components would likely not be cost effective, given the PB's age.
I'll update with a post when I know more.
Please do, and good luck!

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