Lpc2000

Can anyone help me figure out why a certain ISP programming is not
working correctly?  

I can compile one of the Keil demo examples (blinky) and upload it
correctly if it is done through the IDE (Flash, Download) and it works
fine.  If I manually invoke the Philips Flash Utility and do it
manually, it does not work.  I have discovered that if I upload the
hex file thru the IDE and then Download the Flash (which invokes the
Flash Utility Program) that the code is different than when I look the
hex file thru an editor.  The blinky.hex code viewed thru an editor
has code from 0-27B.  When it is uploaded thru the IDE (and works), it
puts code in 0-7FF and some from 1000-17FF.  Does the IDE have
specific locations for code that the raw hex file does not have?  Can
I not generate a raw hex file that can be uploaded directly by the
Flash Utility Program?  Just trying to understand how it works.  Thanks

Sutton