N200 switches off randomly, during boot time and when moved.

Hello everyone,
My 3000 N200 TYPE: 0769-AG2 laptop started to switch off randomly especially when booting, when I moved the machine (i.e.. from one desk to another) or when I pressed gently the bottom left side over the PCI slot.
The situation has gotten worse. I cannot use it anymore due to the frequency of the symptoms.
Actions I have taken:
Operated with AC adapter with and without battery or battery alone.
Cleaned the fan and heat sink.
Replaced the processor's thermal paste.
Monitored the temperature using software.
Formatted the hard disk and reinstalled the preloaded Vista Windows.
Reinstalled the BIOS driver.
Removed one of the RAM memories and swapped places.
Removed the hard disk.
Removed the optical disk drive.
Operated in Safe Mode with and without network support.
Switched off the wifi button.
Excluded through BIOS the PCI LAN and IDE ODD from boot order. Also disabled internal Modem.
And finally, I contacted the UK support where they just suspected a motherboard problem.
None of the actions taken seem to solve the problem permanently. In some cases it worked for quite a while probably due to pure chance.
Remarks:
My machine is out of warranty, yet it is in an excellent cosmetic condition. I only have it for home use. I have never dropped it, smacked it, spilt liquid on it or operated under any abnormal conditions such as on a blanket or a highly humid environment.
*Two of my friends that have the same model face the same exact problem.
*Hundreds of people on the web complain about the same problem with the particular product. 
Could it be a motherboard problem? If yes, why did that happen to me and to two persons I know personally?
A motherboard replacement is very expensive relatively to the total value of the product. What could a feasible solution be?
Thank you for your time reading through my issue.

intrasonik,
It sounds like you have taken great care of your system and approached the problem systematically.  
I'm going to assume this is not a thermal issue since you have cleaned the fan (and verified it is running) along with replacing the thermal grease.  The randomness seems to suggest it is probably not thermal as well.
That the shutdowns may seem to be triggered by movement or pressure in a certain area of the system could suggest an issue with the contacts at the battery or AC, or a short in the system board.
Without doing a repair and some analysis, it would be hard to say with complete confidence.
I agree that the replacement systemboard through service could be perhaps somewhat expensive compared to the cost of new systems with 4 year newer technology.   You might consult the hardware maintenance manual on our support site
for part number and proceedure on replacing the system board.  You could search online for the best price by the FRU number and I would imagine, could find a reasonably priced board and swap it out.   
The service training videos on this system are available here and may also be helpful to you.
Best regards,
Mark
ThinkPads: S30, T43, X60t, X1, W700ds, IdeaPad Y710, IdeaCentre: A300, IdeaPad K1
Mark Hopkins
Program Manager, Lenovo Social Media (Services)
twitter @lenovoforums
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