Thank you all of you for the suggestion....but now I have run into a greater problem and I do not know if i will be able to recover from it or not....so here it goes:

My friend installed filebox on n900 and then deleted some files from the mydocs folder then he started deleting some files from the user/home folder (old applications data that was there after the flash. he deleted those sayin its safe dont worry)

then he uninstalled the power kernal and turned the phone off.

after that..the phone didnt turn on for once and when ever i put in the battery it goes into a loop...shows nokia bright screeen...blank screen...shows nokia dim screen....blank screen....shows nokia bright screen....all this is combined with a slight vibration from the fones's viberator....anyhow.....i tried various instruction on how to connect the phone in flashing mode...the normal way (keep pressing u and then attaching the usb) and the trouble shooting way as well (plug in the usb and everythin with battery removed and then keep pressing you and insert the battery)

Non of these methods work now...everytimg i do this the message on laptop shows "the attached device has malfuntioned please remove and relplace the device"

and the flasher 3.5 keeps on waiting for the suitable device to connect.....

Then i tried to flash it on a Mac...same status .....Please guide me as to what i can do ...if i can do anything....or my phone is dead for ever..i have not tried it on a linux system yet...but i will do so...do you think it will work with that?

THank you in advance...