Try installing Freestyle Dash v1.20. Also, Freestyle Dash v2.0 is coming out soon.
http://www.xbox-scene.com
http://www.sendspace.com/file/cak89w |
http://www.xbox-scene.com/xbox1data/sep/EkyAyEpEZAuLHNZLFd.php
Also, I am assuming you have already done the SMC-JTAG soldering on your Xbox 360 in order to run homebrew -
http://www.tiaowiki.com/w/How_to_JTAG_XBOX_360#Soldering_the_SMC-JTAG_connection If you did, I think something has gotten loose, or the solder has melted. You might need to redo it.
If the latest version of FSD doesn't help. Then I guess the tutorial you are using is not quite good. Try a different tutorial.
USB XTaf Xplorer (any flash drive)
Xplorer 360 Extreme (20-120GB hard drives)
Xplorer 360 250GB (250GB hard drives)