I had the same exact issue...what fixed it for me was I placed my modchip in recovery mode(flipping switch on chip) and then I created an iso CD with the 2.3.1 ( XOS_2_3_1_Recovery.iso to be exact) Xenium on it...After restarting the Xbox with the CD already in , the XOS should be reloaded and the xbox should reboot. Next, I took my modchip out of recovery mode and all was well from there..Apparently the XOS got corrupted even the my BIOS that I had stored in one of the memory banks was just fine. Anyway, hope that helps..
QUOTE(Royal2000H @ Oct 13 2008, 06:37 AM)

Okay, So I have the Xenium, it's been working fine.
I moved a few weeks ago, and now when I turn my xbox on, it reboots twice and then on, but nothing happens.
I get Red+Green in the front.
My Xenium has a solid red light the whole time.
If I pull the xenium out (even leaving the solderless adapter screwed in)
the xbox turns on fine to the microsoft dashboard.
Put the xenium back in = FRAG again.
I've tried researching but I couldn't find what problems (or rather, solutions) corresponded directly to my problem.