Mavericks Grey Screen & Black Screen on Startup

While working with the new Mavericks iMovie and GarageBand, the screen of my refurbished 17" MacBook Pro (bought new last year) became white with vertical light grey bars. I forced shut down. Upon restart after the Apple logo and pinwheel go away, there is just a grey screen that doesn't disappear or turn into the desktop (I waited about 15 min). I forces shutdown again. I tried this another time or two with the same results.
I tried holding option to get to the Restore disk. I chose the Restore disk, but after the logo and pinwheel, now a black screen. Repeated with same results. I tried resetting the NVRAM, a few times in a row, and same grey screen. I tried safe boot mode; after the barber pole filled completely, black screen.
In both black screen (likewise with grey screen) the computer is still on; I hear the fan. When it's black screen and I force shut down, I can see the screen flicker off.
Any ideas?
Thank you!

I just tried resetting the NVRAM two times, and on the last chime held down the option key for Restore disk screen. When I hit Restore, Apple logo and pinwheel as before, but instead of a black screen, it's a black screen with thin vertical blue lines. Weirdest thing.
Thanks for any advice!

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Hi Fred,
Is this happening for all Flash content or just your website? Can you give us a link so we can take a look? Can you also please post back with your system's configuration report?
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I rebooted my computer and now it's working.
When in doubt, reboot, but in my frustration this afternoon it didn't occur to me.
Thank you all so much for taking the time to answer my question.
I hope this simple solution will help someone else.
enjoyride
I get frustrated with Apple too, but if you've spent any time on an Android device, you would know how lucky we are to have an Apple product. The interface is awful and there are no apps, even to get stuck.
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Cyndi

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''FredMcD [[#answer-698567|said]]''
<blockquote>
You are talking about the whole screen, not just the Firefox window, yes?
Do you keep FF full screen? Try using the '''Restore Down''' (next to the
red X) to have FF in a smaller window. Then close / reopen.
Check this:
* see if there are updates for your graphics drive drivers
'''https://support.mozilla.org/kb/upgrade-graphics-drivers-use-hardware-acceleration'''
* disable protected mode in the Flash plugin (Flash 11.3+ on Windows Vista and later)
'''https://forums.adobe.com/message/4468493#TemporaryWorkaround'''
* disable hardware acceleration in the Flash plugin
'''https://forums.adobe.com/thread/891337'''
See also:
* '''http://kb.mozillazine.org/Flash#Troubleshooting'''
</blockquote>
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