why wont Run, my BlinkLED.c compiled by Keil C into On-Chip AT89C51

i made a program to blink LEDs on port 2...
with uVision (BlinkLED.c) for on-chip 89C51
(4kbROM,128byteRAM) and it work well on
uVision simulator

but.. when i compile it, send the .Hex to the
devBoard, it only run the initial command (after void main, before while(1))
i light 1 LED on P1.3 and it do fine...

whats wrong with that? is it the setup matter? how can i setup uVision for my 89c51
on-chip EEPROM?

is any one can help me... ive try it many time, but still dont work..

Thanks.
Best Regards,
Andy Mario

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