HT201177 Macbook Pro is turned on but the screen is black.

Ok, I have read A LOT of discussions on this issue but it seems like nothing works.
I bought my Macbook Pro 13" in September 2012 (so i've had it for a little over a year) in the States. So, I was just using the laptop a couple nights ago, then I closed the lid to the Sleep mode. Then, yesterday morning, I plugged in the charger and unplugged it after the batter's full (showed the green light). Later on that day in the afternoon, I opened the lid to wake up the laptop...but the SCREEN wouldn't display.... It has remained BLACK .... I KNOW the mac is still working..cuz when I turn it on the Caps Lock button shows green light and the sleeping light at the front is working...
I don't think it's  RAM problem...cuz I did that Option-Comman-P-R thingy..and held it until I heard the third startup chime... (I held those keys at the SAME time...WAS I SUPPOSED TO press them one by one??)
Last method I used was the SAFE mode...and now the VOLUME buttons and the keyboard light buttons Dont work now.....
PLEASE HELP!!! THANK YOUUUU!!!

Please make a Genius Appointment and take it in for service.

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