Not able to download program

Thank you for reply.I am using "Ulink ME" for downloading program.I am working on MCB 1700 for last 1 month i don't get any error but from yesterday morning while downloading it stuck for second and after that it is showing error "could not stop cortex-m device ! please check the jtag cable". So I tried it on another board with " LPC1759 " and "Ulink ME" is perfectly working for this board.

Thank you for reply.I am using "Ulink ME" for downloading program.I am working on MCB 1700 for last 1 month i don't get any error but from yesterday morning while downloading it stuck for second and after that it is showing error "could not stop cortex-m device ! please check the jtag cable". So I tried it on another board with " LPC1759 " and "Ulink ME" is perfectly working for this board.

Could you have damaged the board?

Does the LPC17xx have a pin to put it in a boot mode, or other method to mass erase problematic firmware?

Check settings to use SWD, and "Connect Under Reset" options

Have you, perhaps, put the chip into some sort of "sleep" mode from which the debugger cannot wake it?

Or reconfigured the debug pins as IO ?

Or suchlike

Thank you for your reply.Problem is solved . Dont know how ,but i use another pc to download my program and it starts working. I again try it with old pc and its working.