White screen on startup after using Bootcamp

I have a Mid 2011 21.5 inch iMac, 2.7GHz i5, 1TBHDD, 12GB DDR3 Memory, AMD HD6770M.
I also have it configured with a Bootcamp partition running windows, which is about 200GB. The other day, after running bootcamp, I restarted the computer in OSX from the Windows menu. The computer would initially not restart in OSX. It just sat there with the screen displaying all white. I did a hard restart with the power button, and after showing the all white screen for approximately another 5 minutes, the Apple logo finally showed up and it booted into OSX.
Since doing this I now have this same issue every time I turn on the iMac. It's only resolved by holding down the option key and selecting the Macintosh HDD from the available bootup disks. I've been running Bootcamp on this machine now for over a year and never had this issue before.
This is highly unusual, but has me worried. I also had a 2007 MacBook, which got a case of "white screen of death" about a month ago, and its irreparable.
Can anyone enlighten me as to what the problem might be? Failing HDD (it's not one of the recall models)? Motherboard? A problem with Bootcamp?
Any fixes people know about?
Thanks

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