MacBook Pro Core Duo 15" Random Shutdown worsening

Have had my MBP for over 18 months now, and any glitches have been software so far.
Two nights ago, I was working on my MBP and suddenly went into an unwakeable sleep. After resetting, I could start up intermittently up to 5 minutes, but it seems to have gotten worse, to where I'm at a point where I can only manage a few seconds of startup before it blacks out again, either off or again, into an unwakeable darkness.
It's the same with just battery, battery & AC, or just AC. It wont stay on long enough for me to start from CD, neither will it stay on to let me Firewire my info/account to another Mac.
At times when I cannot start at all, I can hear a small 'electrical snap' (best description I can give) when pressing the power button, whichever combination of power source I use. I guess this is normal, but I wouldn't notice it usually.
For anyone who've had their MacBook Pro with "Random Shutdown" fixed by Apple out of warranty, could you give an example of cost?
Thanks
Sion Joyce

i dread to think how much it would cost, but i was having random shutdown problems as of last week. completely out of the blue
but, the latest Firmware update seems to have solved it! not before i went and bought another battery of course
one thing i have noticed though is the eta on the battery fullness is completely random now, it'll go from having about a minute left to having an hour and 30mins

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