Wirelessly posted (htc Pocket PC: Mozilla/4.0 (compatible; MSIE 6.0; Windows CE; IEMobile 7.11) Sprint MP6950SP)
Take the battery out for at least a few minutes.
Then replace it and imediately press and hold the volume down button and while holding volume down press and hold the power button until you see bootloader.
Then flash your shipped rom.
If bootloader doesn't show then I am afraid you have a brick.