T40 video crashes when overloaded, won't show on reboot until it cools off (NOT GPU solder?)

Problem: If this T40 boots up successfully, there would be no problem with light to moderate use even for a long time. But, once it's warm and it's put into standby or rebooted, then it wouldn't boot up (or wake up from standby) unless it has cooled off for about 10 minutes. When it wouldn't boot up, the display would be blank with the backlight on. It also 'crashed' during PC-Doctor 3D video tests.
This doesn't seem to be a GPU solder connection issue as it's not affected by pushing down the GPU. It does have a short fan though. Is it a bad or stuck temp sensor or something like that?
More details...
I bought a T40 for a friend and during unattended XP install:
- the video blanked out (with backlight on) and there was no activity
- forced a shutdown (held down the power button)
- turned it back on and there was a few secs of HDD blinks but then nothing and no display
- turned it off and on a few times, same problem
- turned it off and waited for about 10 minutes
- turned it on, all is normal now
After I was able to finish the XP install, I ran PC-Doctor video test:
- it passed memory tests
- it blanked out (backlight on) during the 3D generation tests
- forced a shutdown
- turned it on and no display/activity (backlight is on)
- had to wait about 10 minutes before I could turn it on again to boot up
I re-installed XP and was able to finish the second install with no issue. If it boots up successfully, there would be no problem with light to moderate use even for a long time.
** But, if it's warm and I put it into standby or reboot it, then it wouldn't boot (or wake up from standby) unless I let it cool off for about 10 minutes. ***
I installed and configured tpfancontrol at a slightly more aggressive (noisier) setting to keep the GPU cooler even though it's doesn't have a heat sink.
As noted above, I pushed down the GPU but that didn't do anything. Any thoughts?
Thanks in advance.
(edit: added T40 to the title)
Message Edited by lenologue on 03-08-2009 08:17 PM

Your T40's GPU may or may not have the "loose" problem, but the issue is definitely there, my guess would be that the card itself is failing.
Just had a planar swapped on one of my T43s due to a very similar scenario...
Good luck.
Cheers,
George
In daily use: R60F, R500F, T61, T410
Collecting dust: T60
Enjoying retirement: A31p, T42p,
Non-ThinkPads: Panasonic CF-31 & CF-52, HP 8760W
Starting Thursday, 08/14/2014 I'll be away from the forums until further notice. Please do NOT send private messages since I won't be able to read them. Thank you.

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T40 video crashes when overloaded, won't show on reboot until it cools off (NOT GPU solder?)

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