IMac restarts when i touch it !!! Weird !

Please Help !
When I touch the back (black part) of my IMac, it restarts.
I already sent to a Apple Center but nothing happened there (they said).
Also, if I tap the table where it sits, it restarts also...
ps: I alread disconected all external devices (mouse,hard disk, usb hub, etc)
What can it be ?
Please help !!
see my previous unsolved post : http://discussions.apple.com/thread.jspa?threadID=1503048&tstart=1373

I had this problem with my 20" iMac. I ended up getting it exchanged for a new iMac, but I did see something about powered USB devices being the possible problem.
I did have a powered device left plugged in on the old one and had the restarting issue. I do not have the restarting problem with the new machine, but I also haven't left the USB device plugged in.
Maybe??

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Memory:          2 GB
Bus Speed:          1.07 GHz
Boot ROM Version:          IM91.008D.B08
SMC Version (system):          1.36f3
Hardware UUID:          1ECBB6EC-1FA8-5F7C-B44B-F0E0B64C9549

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IMac restarts when i touch it !!! Weird !

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