T40 *very* randomly turns off

[notebooknewbie]

This problem has popped up a few months ago.

Basically, at very random times throughout the day, the computer will just completely SHUT OFF. And I cannot turn it back on unless I detach the battery from the notebook unit and reattach it. I thought it might have to do with overheating, but sometimes it'll turn off even after 1 hour of use. Does anyone know what may be causing this?

[jsmit86]

I have had this happen to my T42 several times. I am not certain, but I think it may be due to static electricity when using a mouse.

So far, every time this has happened, I was using a wired USB mouse with my PC. It seems to happen when I move the mouse or just touch it. I have never felt any static, so this is just a theory. So far, this has never happend in the many hours of use when I am not using the mouse.

Common factors during the shut off:

> At my desk in the office at work.
> Connected to AC
> Using wired mouse.

I just switched to a wireless USB mouse, and so far, no further shut downs.

I posted this same question a couple of weeks ago, and the only serious reply thought I needed a new planar board. I guess this could be possible, but it seems strange that this only happens with the factors that I have listed above. So far, the mouse is my main culprit.

Please post the details of when this happens on your machine. We can compare notes.

[ZaZ]

Are your contacts dirty? Perhaps when you remove the battery it fixes it.

[Kyocera]

Possibly the main power supply pcb. This used to happen on my 380ED years ago.

[AbsoluteRaleigh]

This problem has popped up a few months ago.

Basically, at very random times throughout the day, the computer will just completely SHUT OFF. And I cannot turn it back on unless I detach the battery from the notebook unit and reattach it. I thought it might have to do with overheating, but sometimes it'll turn off even after 1 hour of use. Does anyone know what may be causing this?

A lot of T40s do this when the system board is bad. Very common.

Worth noting: some spywayre does this as well.