Power issues all over: is this the end?

Full historic on the laptop:
- PB G4 15" 1.67 GHz bought in May 2005
- logic board replaced under warranty
- hard drive replaced under warranty last year
- battery was part of the battery recall program
- AC adapter died late last year, the thin wire finally came undone and I stopped using it as I started seeing sparks...
I then bought a third-party replacement AC adapter. My replacement battery also started to show its age after more than 300 cycles. I was starting to have issues with me leaving my PB more than a day under sleep, I would have difficulty waking the computer up (had to remove the battery, reset the PRAM, etc...). Finally, a couple of weeks ago, that same occurrence happened again but this time, impossible to charge the battery back. Computer would start fine from AC, I would pop in the battery but it would stay at 0% even after a day being plugged in.
I decided it was time to buy a new battery (NewerTech from OWC) and things were looking good last week. Everything was working fine and I was back at 3+ hours of battery life... Then yesterday, I left my PB open on my desk, plugged in. I came back a couple of hours later, impossible to wake it up. If I press the power, I get the chime, fans kick in and then nothing. Even removing the battery and resetting the PMU with the power button was not working. Only thing that worked was leaving the computer w/o battery and power for like 30 minutes and then starting again to power it up... At first I got a kernel panic (grey screen + noway sign) but after a couple more tries, I was able to start and everything seemed to work fine... But today, again, I'm unable to power on the PB...
Any suggestions? Do I have to start looking at the 13" MBP? It stinks cause I was really hoping I could eek out enough from the PB to have a USB 3 laptop as my next one...

thing is, the release notes state that messing around with core settings in audio prefs can help but they add that different settings will be needed with different projects and i jus can't be bothered to start with all that considering how stable things have been 4 me in the last year or more
maybe i have slightly over-reacted (after one stressful week) but comments like the above (from sliderson) are truly dull & limited. this board is full of peeps lamenting crashes with 9.1.3, big thanx to those like mike connelly who can offer something positive in the midst of general panic
hopefully i'll change my mind as i continue to monitor the consensus of the community here, particularly around this issue of settings for numbers of cores. when peeps who know much more than me about the inner workings of macs tell me these settings really solve the issues i'll listen and take note

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