I bought a used Xbox. When the Xbox was on, it ran fine. But if you turn it off and on again, the above error codes appear. Reset didn't work and resetting to factory settings doesn't help either. I've already tried an offline update (OSU1), but no chance. Resetting to factory settings via USB stick and offline update does not help either. Or. Nothing works since today. At the moment always E106. From time to time E101, E102 or E105. The console ran without any problems for the first 2 days. Then every now and then an error came up. Now I haven't even started it since last night. Always error screen when starting.
Replace hard drive? Does that help?
Think that the hard drive is then over.
Unfortunately, I have the same assumption. Very much hope it's just the hard drive.