I ran in to the same problem on 2 different Xboxs using 2 different Seagate drives. Both Xboxs are TSOP with Ind-Bios 5003. 1 drive was a 500gb PATA and the other was a 2tb SATA. What happens is I can launch Slayers install the software for Mod-Chip/TSOP, install additional dashs and apps but when it reboots it goes to the MS dash. I do the same thing with any other drive and its works as expected. If I reboot to slayers I can go to the file manager and all the files I installed are there....ANY CLUE????