ADUC7026 JTAG Connection Broken

hello,
ADUC7026 on my custom designed board doesn't respond to JTAG rendering the whole board useless. The board worked for number of days before breaking and I could download the firmware as I wished.

The Keil IDE reports no JTAG Device found.
Has any one seen this sort of behaviour before ?

Any one any ideas ? I would be very grateful.
Thanks a lot...

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