or you could download just the kernel and try reflashing that first. it helped me allot of times! after a reflash you keep everything you had. only the kernel wich most of the time causes the problem gets renewed.

Here is a simple flasher tool a friend made. just install in C:/N900 and run the flasher. (32bit windows only) then make the choice speed up to default. this will reflash only the kernel. kernels and firmware PR1.3 are included in the download

also root backups made by bootmenu can be flashed back on the device with this program

http://www.sygysweb.nl/n900forum/vie....php?f=9&t=269