Ok. This is what I did now. Removed the battery from N900. Inserted battery back after sometime. N900 did not start by itself. Plugged the USB cable and connected it between N900 and PC. N900's glowing light started to blink indicating that its being charged. N900 still did not switch on by itself. Then I powered on my N900. I went till the menu screen (10 seconds) and then I got an error in an yellow line on the menu screen saying "Internal error. Application 'Camera' closed." And then the usual process of continuous reboot started to occur while connected to the PC itself.