Lpc2000

I've been developing code for several months on the Keil 2130 board 
with a 2138 - no problems I haven't been able to figure out so far. 

Now I have my new board with 2136 and it doesn't appear to be booting.  
I've compiled with Keil target info set as 2136 and as 2138 and they 
both run on the demo board.  On the new board it gets through the first 
few LDR in the startup code, then gets stuck somewhere up in the boot 
sector.  I've also probed the flash memory contents  on both boards.  
The code is actually different at 0x00000000 but looks the same at the 
end. 

Do I need to set something else in the compiler?  Do I need to set 
something for the boot mode (I'll be reading up on that in the menn 
time).  Any hints/advice is appreciated.

Kathy