I had the same issue on my 1.6 Xboxes, i just pressed Down and A, a few times and it was fixed. If not you can use a different launcher like Ava Launch also make sure the emulators are the latest versions.

I TSOPPED my 1.3 Softmodded, Seagate500GB Pal Crystal Xbox with an Alladin XT Plus 2 Chip and it boots up with Unleash X. I followed this tutorial doing a few things differently since it's not a 1.6: https://www.youtube.com/watch?v=G6Yj2yiTIXE Aswell as the diagrams on the ISO ZONE and i successfull...