OK, This is going to be a long post but I guess its better to give all possible details. First5 though, I would like to thank all the people who have posted here. Until I found this thread, I had almost given up hopes of reviving my laptop but now it at least seems possible. Now to the actual stuff. My problem with my t40 (1.5 Ghz Pentium M, 1 Gig RAM, 60 Gig HD 5400 rpm, Windows XP SP2) is 2 pronged - 1st my computer just freezes and hangs and when I shut it down forcefully and try to restart it, it won't boot and the fan problem starts. At first I thought that both the problems were related, so I formatted my HD and reinstalled Windows. Unfortunately, the problem became worse and my laptop started freezing after abt 30 mins of operation and then wouldn't reboot.
So I decided to follow IBM's troubleshooting guide. This is what I did:
1. Ran PC-Doctor - Everything was fine.
2. Reseated hardware (DIMM, HDD, CD/DVD Drive, Mini PCI card) - Problem was still there.
3. Updated BIOS - NO Help.
Then I found this thread and this is what I did:
4. Took everything apart to check for the magnet thingy. Here I found that the T40 mobo is diff. Found only on the underside and it was firm. There were a few on the top side as well. Checked them too. Everything seems fine. Put everything back together and rebooted. The boot problem seems to have eased up. M/c boots up 1 in every 2-3 attempts but still freezes after 30 mins.
5. Removed the Mini PCI card and the daughter communications card. Now my system is running much better. Freeze frequency has dropped but the problem is still there.
So now, I really don't know what to do. Will try to update my drivers but I don't know how far that will get me. Can anybody suggest what might be the problem or how to fix the freeze/reboot issue. Any help will be appreciated. I need my PC for work and I can't afford a new one now. Thanks a lot!!