I have an xbox 360s 250Gb with Kinect.
When I power up, it goes through POST (xbox logo) fine, but with a slight delay at the end. I then get a update msg for Kinect. I click ok to update, but then an error msg pops up telling me it failed to update due to missing or corrupt files. I am then able to continue on to the dashboard without signing in to LIVE. If I go to settings to see storage devices it tells me my original 250Gb HDD is unformatted. Most of my saved games are in the cloud. SO, I continue to go ahead and format the HDD, I provide my serial number and click ok. It starts off as 50% formatted, freezes for a min or so than completes. When I go back to storage settings it shows my HDD as UNFORMATTED again. If I power down uplug everything and reseat the HDD and power on I go through the whole cycle again.