i've got the same problem ! icalled dell and said to them that i try to replace the fan with jack and swapped with my friend 9100 and it didn't work so i put his in mine and it DID work so the person in dell said they gonna send me a new...
i've got them from my country ehh could not get them in london my was a little bit too thin so i put one on top of another and put some as5 between and it was fine
i did not use any glue !
i've clean the copper plates with nail-file ...
i just finish my copper mod.
time about 2h
cost about 22 pounds
i've put as5 on processor also and idle temps are:
cpu: 46 C 3.2 ghz
Gpu: 53 C (oc 412, 400)
ati tool benchmark 50-52% load of cpu and temps
cpu: 49 C