X-61 goes dim, power dies, requires battery removal, reseating to restart

This seems to be a variation on the X-60 problem - twice now my X61 running Vista Business has simply stopped operating (not shut down), while in the midst of normal operations. The screen goes dim (as if it were going into power saver mode while on batteries), then black, with no lights lit - including power. The workaround is to unplug, pull the battery, then re-seat the battery and plug back in.
When the workaround is followed, the system powers up normally, advises that there has been an incomplete shutdown, and offers safe mode as a startup option - but starts normally.
Any suggestions?

I would want to run the Apple hardware test, to see if there is an obvious hardware problem:
1. Disconnect all external devices from your computer except the keyboard and mouse. If you have an Ethernet cable connected, disconnect it.
2 Insert the Mac OS X Install Disc 1 that came with your computer.
3 Restart your computer and hold down the Option key as it starts up.
A list of available startup volumes appears.
4 Click Apple Hardware Test and click the right arrow.
5 Follow the onscreen instructions when the Apple Hardware Test main screen appears
(after about 45 seconds).
6. When prompted, choose the extended test.
Does this give any error messages?

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