I'm resurrecting my old thread on this "xbox left unpugged" problem as I'm continuing to have problems. See the first post for initial description of the problem. This is Xenium ICE chip on v1.1 xbox.
I thought I had fixed the problem by reseating the D0 wire (this is a solderless install using the blue adapter). But "fixing" the problem by reseating D0 was just a conincidence. The xbox will boot to XBMC several times, maybe even for a day or two, but then it will only boot to M$ dash, as if there is no chip installed. I can reset the date/time in M$ dash but this doesn't achieve anything. If I just remove the chip and then replace it the xbox will boot to XBMC, for a short time, then will revert to only booting to M$ dash. This is reproducible, every time I have the problem I can remove/replace the chip and I'm back online. This isn't an acceptable solution though.
I have had the xbox connected to one of those (expensive) surge protecting power boards for a few years now and I have heard this can cause problems as the xbox isn't getting enough current or whatever when it's turned off. But I never had this problem until I unplugged for 6 weeks. I've now had the xbox plugged directly into a power socket (bypassing the surge protector) and it's been OK for 5-6 days now, much longer then previously. Doesn't prove the problem is solved but at least might be getting somewhere. (I would ofcourse rather have the xbox plugged into the surge protector).
What is the best way to workaround this problem? Continualy removing/replacing the chip is not a solution, and sooner or later I will have to cut the power to the xbox for an extended time. I've read that some later BIOS or later version of Xenium OS can get around this problem. I have not changed BIOS or Xenium OS since installation. It's running with BIOS X2 4983.67 and Xenium OS v2.0 Pre Release. I'm not sure what BIOS or Xenium OS I should move to, not even sure which ons are available anymore. There were some suggestions given below by gogniben but not sure if that info is still current.
Any assistance would be greatly appreciated.