Some games on the Xbox version 1.6x will be scrambled with most dash boards when using High Def displays
To fix this just disable 480p the games will then be unscrambled but is displayed in 480i
Another option is to use Complex tools to launch these games with 480p enabled this will also unscramble the image and displays in 480p
The only issue with the second option is that it will not work with all games will unscramble that way
I was going to list the issue games but I switched xbox's so now I am using a 1.2/1.3 xbox I just unlocked my HDD with the eeprom from my 1.6 xbox and re-locked it with the eeprom from the 1.2/1.3 xbox (when I ID'ed what version I had it outputted 1.2/1.3 so I don't know the exact version and not interested enough to recheck with an alt method )
[I also kept the DVD drive from my 1.6 as the 1.2/1.3 drive was sticky as in it didn't want to eject, but that's a common issue]
NOTES
There is a list online that says use evox to launch through but the games he lists and info is all messed up and inaccurate, there are games in his scrambled list that just work on a 1.6, or would just show a dirty disc error that can be fixed and his not working list has games that do work on a 1.6 (maybe all the games work in his none working list, but I have yet to go through all the ones he listed so can't verify that, the ones I did test though all worked), perhaps he just had a bunch of none working disc images, I don't know but the info is not valid, he does say he messed the testing up though.
The evox idea is a good one though as you can use it like a shortcut by editing the ini so only a single game is shown and should work the same as Complex tools does again not every scrambled game will be un-scrambled with this work around (I have not tested the evox method myself though but from a single game he tested I did get the same results and the only way for that game to work is with 480p disabled).