had a situation recently too where my N900 didn't want to start up any more neither. i'm on GNU / Linux thus don't usually have LostDOS around (except @ work ) but for some reason had that started up & running that evening, so i tried to connect the N900 to that... it took the PC (with se7en 64bit) a connection to recognize the N900 but after that NOKIA Suite (i had installed a few months ago to upgrade N8 to Belle) kuicked in and the N900 started up if you have a PC with NOKIA Suite handy, it might be worse a try...