I'm not sure if Entourage put a recovery partition on the eDGE, but perhaps another forum user might know.
If not, you have two options. You can either download the original Dingo Release and re-install it:
http://www.ethanphoenix.com/entourag...ate.golden.zip
OR you can download the Ermine Update and try installing it instead:
http://dustyfeet.com/edge/p-update.zip.ermine-0.9.zip
I have attached two procedures. The first explains how to downgrade from Ermine to Dingo but you should be able to use it to just install the original Dingo. The other explains how to install the Ermine update. Good luck.