stick with this topic....
it has to have a connection problem somewhere. check the d0 connection and connections on the LPC. make sure the chip is on right. the "X" in "Xenium" is towards the back of the xbox and its on the 12 pins closest to the screw.
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let me refrase what I said... When I first installed mine, the led it was red... it booted into XOS I backed up the things I needed to then I unlocked the harddrive then I restarted it then it wouldnt go to the XOS it would only run the xbox startup the go to the system message and cant get back to the XOS to lock it back....
it shouldnt have been red in the first place. to tell you the truth this has me stumped.if it worked before you restarted it should work after implying nothing happened to the connections. try and take the chip and (im assuming) the adaptor. and re-install. you might have to perform a recovery from a disc.