Try booting into XeLL first, see if that works and reboot the xbox.
Other things you could try is building a newly hacked NAND with JRunner (use your NAND backup for this)
You also might want to try a clean launch.ini file on a USB thumb drive.
Thanks for these, i have only just gotten round to dealing with it. I do not think i have a nand backup (the console was second hand) and I am unable to get it to get past the boot screen (it did boot into dashboard previously and I was able to run games etc, but something happened, possibly with the server?) Would appreciate anywhere I can read up on this stuff rather than keep bothering you guys. Thanks!