Lpc2000

I've apparently trashed by bootloader and am having a tough time
getting back to where I can talk to my Keil 2140 board serially.  I've
been playing around for a week now with sample Keil code examples
getting familiar with how things work and connecting and uploading and
downloading fine.  It was going very well until I got brave and
uploaded a sample piece of my own code.  The board locked up and I
have been unable to get it reconnected (thru the Philips Flash Utility
program).   I get the infamous 'Cannot communicate with test board"
message. And, P0.14 and RESET don't seem to kick it into ISP mode
where I can make a connection.  Any help out there.  Thanks.