IBM Thinkpad 600X erratic boot problem

Sometimes black screen and no reaction when power button is pressed,
other times it boots fine, typically pressing the button 4 times will
boot and then the laptop can work fine for hours with xp, no crash.
Bios upgrade was no help, any ideas aside of bad caps (which i doubd as
i can rapidly press the button a few times and it boots, so no warmup
period.
Note that when the laptop does not boot the power led still comes on, so no faulty power button.

Bart Bervoets
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