[Psyduck]

That sounds like the kinda thing I'm after. I don't have a custom HD, so I've nothing to worry about there. You say your evox is called evoxdash.xbe and loads up because of the boot sequence in your bios: Is this defined by you? If so how? or is it just the bios standard?
I guess I should try doing the same for me and seeing...

Thanks for your help there!

And about the mod-chip staying on, I'm assuming provided my LED is green, I'm safe to go on xbl? And orange means don't do it?

Edit:
Renamed xboxdash to evoxdash and msxboxdash to xboxdash and I now get either the original or evox depending on chip on/off. Thanks a bunch!