A couple of days ago, when I went to turn on my trusty Xbox, I got a red light of doom and an error message [E 68]. After contacting chat support, the problem seemed to fix itself and the Xbox was completely usable again.
Now, two days later, I've been trying to start up my console for the past hour with no luck. Removed and replaced the hard drive, rebooted it countless times, and every time I turn my console on it's usually one of three scenarios.
A] Splash screen goes smoothly, then error screen
B] Splash screen takes 5 minutes, then error screen
C] Splash takes 10 minutes, then goes to sign in screen, then just sits there after I select my profile; claiming to be signing me in but never moving past this point.
Before the first error message popped up, I'd never even touched the hard drive or used any transfer cables or third party products. I wasn't even aware as to how to get to the hard drive until that little light showed up. I'm beginning to wonder if the latest update had anything to do with this, but I'm just hoping I don't need to buy a new hard drive.
UPDATE: as I was typing this, I let the Xbox keep trying to sign me in just to see where it'd get me. Well, I'm finally on my dashboard so I'm now in the process of copying all my save games to the cloud while I have the chance.