T42 strange problem, once shutdown cannot start again

[wallacel]

As the title said, my T42 suddenly behaves very weird. After sitting for overnight, I can turn it on normally. But everytime after use and shutdown properly, it won't start up again, no lights at all when I press the power button. I tried both with/without battery slot in but still no success. The only way I can start it up again is to let it sit overnight, once started I can confirm all the hardware components are working fine.

Running WinXP with 1G ram, any suggestion to try?

*I am very impressed to see this forum is so active for such an old machine, thanks everyone to keep it alive.

[wallacel]

Answering my own question.

The MB was dead completely, no readings from F2 fuse. I replaced it with a T43 MB and upgrade the CPU (2.1) and max out the ram to 2Gb, and my thinkpad is alive again.