Usually the Crossworks startup code contains a forever loop immediately 
after reset to allow the debugger to connect before the code continues. 
Unless some macro is set. The result is exactly the behaviour you 
observe: The code runs when started by the debugger/IDE, but not 
without.

Likely topic #1 in Rowleys FAQ. I've already suggested to replace the 
forever loop by a limited loop (acknowledged). Same result with debugger 
- but just a delay without.

Hello,

Thanks for your responses.

In have attached the LED toggle code. Its working fine with JTAG. After 
resetting through IDE (Target->Reset Macraigor Wggler), also its working 
fine. But after hard resetting its not working.

And same source files are working through Keil workspace, after hard 
reset.

I would really appreciate your help.

-Prakash

Please take a look at Rowleys LPC1700_Startup.s. The issue is explained 
in some details right at the top of this file, beyond the copyright 
statement.

Thanks for your response,

I have defined STARTUP_FROM_RESET in "preprocessor defnitions". But its 
not working.

Did you recompile everything, startup code included? Verify that the 
reset loop is not included by analyzing the result.

Ya I recompiled and flash the code on target.
I ensured that the Reset loop is not included.