360 Troubles, Part 1

My XBOX 360 has developed a firmware problem and will be in the shop after I return. For no apparet reason the XBOX guide has dissapeared off my XBOX! I was instructed by Microsoft technical support to disconnect my hard disk and see of the problem persisted. It did. Now, they're wanting me to send it in. More on this later, but keep tuned in as this may be a sign of an otherwise unknown XBOX glitch that may affect others than just my self.