When I turn on or restart my Macbook Pro Retina 15", my entire screen flashes completely bright yellow for a few seconds and then it goes to the normal Welcome screen. How do I fix this??

Hi Everyone,
This problem just started today. When I turn on or restart my Macbook Pro Retina 15" (Mid 2012 version), my screen is light gray like normal, and then after a few seconds my entire screen flashes completely bright yellow for a few seconds, and then it goes to the normal Welcome screen (where I choose to login as myself or a guest user). This suddenly started today and has not stopped since. This keeps happening every single time I turn on or restart my computer.
Yesterday I installed all the Mavericks and other updates that were available in the App Store, so I'm wondering if this is related to that since this never happened prior to my doing those updates yesterday. When I first installed the new OS X Mavericks (10.9.3) update, it went through the whole installation process (took about 10 minutes), and then during the installation I got an error message saying that it couldn't verify my iTunes application that was on my laptop, and then my laptop finished installing the updates. Then once my laptop restarted, the App Store "Updates" section said that I had to do the whole OS X Mavericks (10.9.3) and iTunes (Version 11.2) updates all over again. So my laptop did the whole installation again (took about 10 minutes, but this time I didn't get that "iTunes error message" during the installation process).
Now, when I go to the App Store "Updates" section, it says the following under "Updates Installed in the Last 30 days":
-Digital Camera RAW Compatibility Update (Version 5.05) installed May 15, 2014
-OS X Update (Version 10.9.3) installed May 15, 2014
-iTunes (Version 11.2) installed May 15, 2014
-OS X Update (Version 10.9.3) installed May 15, 2014
-iTunes (Version 11.2) installed May 15, 2014
-Security Update 2014-002 (Version 1.0) installed April 22, 2014
I'm wondering if this flashing bright yellow screen upon bootup is related to the fact that my laptop installed the OS X Update and the iTunes Update two times each? Or is this new problem totally unrelated? It's just that this problem started a day after these 2 updates were installed twice.
My Macbook Pro Retina 15" (Mid 2012 version) is otherwise working fine at least as of now. The only issue so far is this flashing bright yellow screen every time I turn on or restart my computer.
If anyone could please help me fix this so that my bootup screen doesn't flash completely bright yellow anymore, I would be forever grateful!
Thank you so much for reading this and for any help you can provide.
hope everyone is well,
Elaine

Hey everyone in Apple world!
I figured out how to fix the flashing yellow screen problem that I've been having on my MBP! Yessssss!!!
I found this super handy website with the golden answer: http://support.apple.com/kb/HT1379
I followed the instructions on this page and here's what I did:
Resetting NVRAM / PRAM
Shut down your Mac.
Locate the following keys on the keyboard: Command (⌘), Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.
I went through the 6 steps above twice, just to make sure I got rid of whatever stuff was holding up my bootup process. Since I did that, my MBP boots up just like normal. No flashing yellow screen anymore!!
(Note that I arrived at this solution when I first saw this page: http://support.apple.com/kb/TS2570?viewlocale=en_US)
Let me know if this works for you!
Elaine

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