Thanks for reply
There is a different problem with My N900 along with the previous problem.
The battery is not charging properly when OS/N900 is on
but it charges properly when the N900 is swithched off.
Currently also the opt ( Home ) file system has 108 kb available.
whenever I like to do any entry or download software. there will be message that Device memory is full . Remove the data to function properly. Kindly guide me