Lpc2000

> Thanks for your reply,
> 
> it didn't work :-(

This same code was running on an Olimex LPC2129 board over a month ago, no
problem.

> 
> What is IAR version you use ?

4.30A

> 
> what can i do more than that?

The code you posted initially had a while(1) in your timer interrupt.

My suggestion is download Micrium application note again.
Do-not-change-anything in any of the files.  Extract the .rar I sent you,
and overwrite appropriate directories.  It will work by pressing debug if
you use J-Link.