Xbox softmod problem

I have a 1.6b xbox. I softmoded my xbox using the mechassault method successfullly, and I had been using the evox dashboard. However, I then elected to upgrade the MS dashboard. After I did this, the xbox cannot read discs. I then reverted to the MS dashboard. Now it displays the message “Your Xbox can’t recognize this disc. Make sure it’s an Xbox game, DVD movie, or audio CD. Also check to see if the disc is dirty or damaged. Remove disc to continue.” This happens with every disc, even if I try to boot with the disc in the drive. I also can’t FTP to the xbox. Any help would be appreciated.