my guess is you are trying to do this on the stock hard drive. in that case, make sure your xbox is working properly like it would off the store shelf. then:
1) ftp into the xbox and copy c: and e: (dont add/change/remove files)
2) make the xboxhdm with c: and e: (dont add/change/remove files)
now you have an exact replica of your hard drive, so even if you ruined it, you could restore it to original. you can test this by taking a spare hard drive that supports locking and build it with xboxhdm. then lock it, pop it in your xbox and it should work.
why do it this way? because you dont have to burn 7 cds with different files everytime.
now all you need to do is ftp to your xbox via gamesave, and add/change/rename the files accordingly. if it hangs or gives you an error, try to power up the xbox with the game in the drive and ftp back in, making necessary changes.
if you come to a point where it wont run the game and youve lost ftp access, then remove the drive and restore it with the disk you created. repeat until you get it right.
also make sure you are habibi signing whatever your e:\default.xbe is...otherwise you will get nothing. you will know the bootloader is working if the led turns solid orange....if it does then make sure you have c:\evoxdash.xbe...if that dont work rename c:\evoxdash.xbe to c:\default.xbe.
here is a great thread on what you should have in your c: and e: drives AFTER UDE...its about halfway down the page:
UDE Resultsi hope this helps...