Upgraded to Maverick, now MBP 2011 has black screen while booting

I just upgraded from Mountain Lion to Maverick, and I am already regretting it. Upon installation, my MBP (2011) was running slow, so I restarted it. Now, when my Mac is trying to boot, the brightness is at (roughly) 25%, and I can barely see what's happening. It looks like the loading cursor is present onscreen. The good news is that I can hear the startup chime. However, after 10-15 seconds, the screen fades to black. When I press any key, I can hear the default error sound. I tried Command+R, but that didn't do anything. Any help would be greatly appreciated!

Not sure what happened. Upon the umpteenth time restarting the laptop, the scree is now at 100% brightness. I was able to log in as well. All is good.

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