I have cloned the system to my SD card, and i downloaded a tool called 'maemo-control-services' so that i can check which service is running and can also shut down services as well, not surprisely, i tried to shutdown some service (GPS etc.. ) and reboot, it seem works fine but just stopped when the progress bar ( i don't know how to call it properly..) was completed , somehow , after few seconds, it goes reboot and repeats the same behaviour infinitely without any warning but can connect to computer and you can add or delete files .

I'm not sure whether i have shuted down some services that leads to boot failure, but i'm sure once i have shuted down some services made the media player couldn't play mp3 files, and i started them again, the media player works fine.

So I have tried on both system (one on internal card , another one on SD card),both won't do. In the end i have to reflash my device and clone it again so i won't screw it up. What happened ?