PB cutting out - worrying

Hi,
I have an almost 3 year old rev. B 12" PB with 768 MB ram. I replaced the Toshiba 40 GB hd with a 100 Gb 5400 rpm seagate drive about 5 months ago.
Last night, while running lightroom and probably a few other apps in the background it just shut itself off. No warning, nothing in any of the system logs, it just went off (battery wasn't anywhere near empty). After switching off it would not come on again for a few minutes.
I imagined it had probably got a bit hot and some sort of emergency thermal cut out had come into play (this would also prevent it from turning on again straight away I presume), but it didn't feel hotter than normal (which is admittedly pretty hot) and the fan was not on full power.
This morning, when sat in a nicely air-conditioned room, I opened the lid to wake from sleep (having been asleep for ~40 minutes) and it shut itself down again! Nothing in the system logs, but this second time it alowed itself to come back on straight away. The date had been reset to 1970 when it did come back on this time, which I take to mean that the PMU has been reset (not by me).
Does this mean it detected the PMU configuration was not correct and switched itself off to fix it? The PMU is backed up by a small watch battery, right? Could it be that that battery needs replacing? I notice that the fan is going quite a lot these days (temp seems to be hovering around 45C), should I consider replacing the fan as it is coming up on 3 years old? I've also been told that sucking at the air vents with a vaccum cleaner might help the air flow.
Any other ideas as to what caused that? No crashes (that weren't my own fault) in 3 years and then 2 failures within 24 hours is a bit worrying! The first shutdown I am happy to attribute to heat, but not the second.
thanks
James
PB 12" Mac OS X (10.4.7)

Welcome to Apple Discussions!
It is possible the clock battery is beginning to need to get replaced. It is also possible the PMU is beginning to fail. Try plugging in the computer to a battery backed up surge protector with no main battery to see if it makes a difference. If it doesn't I'd lean more on the clock battery or PMU of the computer. Sometimes unreliable home power can cause power issues for computers. Sometimes batteries dying can.

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