BB Curve :: 8900 Not Booting, Stuck On 3/4 Progress Bar?

When i turn on the BB, it gets past the initial red light stage and when the OS actually goes to load, it will load to 3/4 of the way along the progress bar and just stop, constant reboots and battery pulls it will stil load to 3/4's and stop,I have tried using the application loader from command prompt as described in some threads on here and using the JLCmder, using the plug in and press next when the red light comes on, this process works untill the aplication loader tells the device to reboot and it loads again, cos it gets stuck 3/4's of the way, the application loader cannot continue and finish, it just sits there constantly trying to connect to the phone.