try this
When your device fails to start, it show one of these symptoms
A. Totally dead
Physical damage, water is the worst enemy of delicate electronic device. Try to hardware.
B. Trying to restart, LED activity only.
Your device is not able to start, something has gone wrong and the OS is corrupt.
C. Failed to start, a white screen with an error message.
Geeks call this an "Uncaught exception error". That is a polite way of saying, the last thread has terminated, the OS has halted because it is corrupt.
In many cases, the Application Loader can be used from Desktop Manager or Windows, If that fails to connect, there is one final solution.
A. In order to restore the device, you need to have BlackBerry Desktop Manager installed. The original, as supplied on the BlackBerry CD is adaquite. Tip: If you choose to download the newest v4xx, you can save a lot of time by choosing custom install and disabling Roxio Media Manager. At start-up, it really slows things down until it has built up it index of media.
B. After it is installed, you need to install a BlackBerry OS file that is specific to your device. The original version, as supplied by the carrier, is the safe choice, but you can use any model specific version. This is not supplied on your BlackBerry CD.
C. Once the OS has been installed, you have to prepare it for the device.
Delete the vendor.xml file located in c:\program files\common files\research in motion\apploader
D. You are now ready to restore your device. Verify that BlackBerry Desktop Manager is NOT running. Plug the device directly into the computer's USB port.
Windows XP: Start / Run... / Command
Windows Vista: Start / Command (type this into 'start search')
CD \
CD PROGRAM FILES
CD COMMON FILES
CD RESEARCH IN MOTION
CD APPLOADER
LOADER /NOJVM
http://forum.gsmhosting.com/vbb/f489/frequently-asked-questions-about-blackberry-phones-560789/
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