Thanks ossipena and bsving. I tried those options too, but to no avail. It still kept rebooting when connected via USB cable to the PC. PC detects the fone and tries to install the driver and then the fone switches off and PC notifies saying "The driver installation failed". The same process repeats when the phone keeps rebooting. However I'm able to access the folders in the disk space/folders (32GB) of N900.

Do you think updating the firmware and flashing the device might make the phone work?