Fan not working. Hardware problem, or is it just quiet, or is it Linux and DSDT? How can I know?

Hi.
The fan in my Lenovo 3000 V100 doesn't seem to work.
- On Linux (Ubuntu 10.04) the laptop overheats sometimes to point of shutting down.  
- I don't use Windows, but I tried a bootable Windows CD and it seems the fan isn't working.  I can't hear it and it doesn't seem that any air is coming out of the fan.  I tried with Thinkpad Fan Controller 0.20 and manually setting the fan speed to the maximum.  I noticed no difference.
- When starting the computer I can hear the hard drive the first few seconds, but I don't think I hear the fan so I don't think it's starting at all.  Os is it so quiet?
How can I be sure it is a hardware problem?
I ask this because a many laptops have problems in Linux with DSDT (a file from the BIOS) than only work on Windows.  And I have had this problem in the past.  (I tried compiling the Linux kernel with a DSDT I fixed myself and posted in this forum 2 years ago, but this time it didn't work).

are you able to monitor fan RPM ?
if not how comes this is not availble to read that info?
may this help :
http://forums.lenovo.com/t5/Linux-Discussion/reading-fan-status-under-linux/td-p/115368/page/2
http://rzr.online.fr/q/lenovo# g470 s103t (Please Contact me if your s10-3T is booting win7 or support bluetooth, 3g)
Lenovo S10-3t | Model Name : 0651 | Mfg Date: 2010/06/08
Lenovo G470 | Model Name : 20078 | M fg Date: 11/03/23 | BIOS: 40CN23WW(V2.09) 06/20/2011 | CPU: i5-2410M | Linux version 3.3.4lenovog470+ (root@lap) (gcc version 4.6.3 (Debian 4.6.3-4) ) #8 SMP Tue May 1 10:23:48 CEST 2012
OS:GNU/Linux/Debian

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