IMac won't boot after upgrade to Maverick

First off, I have a Time Machine backup, so I'm not in really deep hot water yet, but...
Upgraded to Maverick from Lion 10.7.5 and let it run for ever and a day until it rebooted itself. Upon reboot, I got the grey screen with the Apple logo, then the little spinny thing beneath the logo disappeared...and nothing else happened. The iMac gets stuck like that and won't do anything else. I have only the keyboard and mouse connected to it — no external drives, no hubs, nothing else USB or FireWire. I can reboot to the recovery disk (which it now says is the 10.9 version). I have verified permissions, repaired permissions, verified disk (no problems) but repaired disk anyway, tried reinstalling Mavericks (and let it run overnight but got the exact same result) and even booted in single-user mode to run fsck. Nothing so far has worked.
I'm stuck with a grey screen and the pretty Apple logo, but can't get to the login screen or do anything else with it. Suggestions?

I spoke to Apple support and they've given me some suggestions to try when I get home tonight:
Mac OS X: Gray screen appears during startup
OS X Mavericks: Reset your computer's PRAM
Intel-based Macs: Resetting the System Management Controller (SMC)
Mac OS X: What is Safe Boot, Safe Mode?
Resolve startup issues and perform disk maintenance with Disk Utility and fsck
Mac OS X: Starting up in Safe Mode
Startup key combinations for Intel-based Macs

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