LPC2129 ethernet board led blink

I’m currently trying just get a led to blink on my lpc2129 ethernet board. But it seems not to work, even thow it worked before. I want to know whether or not my source code is executed. I’ve used the option in “Buffer”“Flash Buffer Operation” the “Code execution” and “Run from Address” is &H00000000. Is this the incorrect adres? Or is there just a way I can be sure that my source code is executed, by removing the BSL or JRST headers, or by putting “Execute code after upload” on.