Black boot screen and startup manager on mid 2014 rMBP after upgrading to Yosemite

After upgrading to Yosemite I'm experiencing black booting process. Moreover, I noticed that the startup manager, which we access by holding the option key, has the black background too. I didn't like the Yosemite, so I downgraded back to Mavericks, but I still have the startup manager with the black background and the initial screen during the startup sound is black too, and after that the grey screen with the Apple logo comes up, which is typical for Mavericks. I want my startup manager to have the grey background as before. And also, before there was the grey screen during the startup sound, not the black one. How to revert all this to the previous state? I'm experiencing all this on my rMBP, 13-inch, mid-2014.
I want to revert because after downgrading back to Mavericks my rMBP started freezing terribly, especially on youtube, ebay and app store. And it's not just the web browsing, it's freezing when navigating in finder too. I know there are many experienced users here, so I hope that somebody can help me with this. Before upgrading to Yosemite my machine was running flawlessly.

nobody?

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