Works in JTAG mode but Normal mode fail to run

Hi,
Though it is not my first LPC2148 based project, this time im encountering a strange problem,
I found my hardware is able get flashed through JTAG successfully, but fail to execute.

I tried to debug the program in RAM using JTAG, to my surprise blinky program executes. but program from executing from flash fails. my hardware configuration is on reset P0.14 is pulled high and rtck pin is floating.

Any quick fix will be a great help

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