The FRU 41W5204 fan is what you want - it is a replacement of the older 13R2657. Try search this forum for 41W5204, and you will see that it is recommended by several users as the (long) low-noise fan for T42/p's.
Cool! I ordered it yesterday (IIRC) and though I only paid for 2-3 day shipping, it arrived today by DHL. Yay!
I put it in and the laptop booted successfully. I'm currently running Prime-95 in torture mode, maximum heat setting to make sure I've solved this problem.
I'm also defragging the HD at the same time. I'm a glutton for punishment I guess
* One question. I noticed the 41W5204 arrived with a pink peel off pad over the part of the fan which sites on top of the graphics chip. I thought it was weird because, beneath that, there seems to be dark thermal grease evenly spread (it was easy to scratch, but I only scratched a small bit to test.
I peeled off the pink pad and put a very thin swipe of Arctic Silver 5 on top of the dark gray material. I used the playing card method someone else described here.
What that the right thing to do? Seemed to me, but oddly, the old fan I pulled out had the pink pad still attached.
You say you have a 14"
T42 (in your signature), but you talk about a 2379-DXU
in your previous post... and the DXU is a 15"
Noted and fixed. I just did my sig from memory, before the T42, I used a T22 at work (love those Thinkpads!) ... that's probably what I remembered the 14" measurement from.