If you have read all your replies, you have missed a question...
Are you running DS 6.9 or 7.1 this can make a difference...
Also
andykn101's solution is one that I used to use and works great also.
Here is what I do and you should be able to do the same...
NO the DS server does not need to be up and running to do a install.
When I use the DS to image a macine, I just create a couple tasks to do the following:
copy the client to the workstation
and on boot up install it.
This will also work for you, because it will just over right the current info. guid included..