jsut need to flash a different MP....(you might be able you flash the one you tried originally, but something was "miswritten" so I'd try another that matches your s/w version) keep us posted...
i would say look for rsd lite 3.9. there is a 4.1 (which is what i use) but if you get that one, make sure the installer is .msi. if it's .exe, it contains a virus.
i had the same problem but when i flashed my stock MP the phone doesnt go to BT mode or turn on, the keypad lights up but the screen stays black, when the phone is plugged into the computer then the computer recognises it