You say you used Xbox Live with modded machine. If you went live it might have corrupted the dash, hence will not boot.
But first off get the linux bios off your chip (cromwell) as it wont boot unsigned code, thus you having problems booting evox and everything else for that matter. In order to this you need to make a boot disk with a X2's bios. Cannot tell u were it is, as it's illegal.
Go here for help on making the disc
http://www.xbox-modchips.com/tutoria...e-cromwell.htm
I suggest also, that you make a evox disc using the data burn method instead of doing an ISO. (Stickys). In addition, make sure your FTP settings are correct. If your using a crossover cable PC2Xbox set it to static IP address.
Hope this helps!