3 beeps after ram upgrade, computer will not turn on, please help! I have tried everything.

I have a late 2011 Macbook Pro 15 inches, i recently upgraded the RAM from Crucial 8gb (4gbx2) to Crucial 16gb (8gbx2). I have done thies before, was er careful, and had antistatic clip, clean work surface, etc. When trying to turn the computer on again, i hear 3 slow beeps, repeated three different times, and the computer does not turn on. I have been looking around for solutions.
I have already swapped the memory modules, cleaned them, dusted the whole computer with air can, put the old ram in and still have the 3 beep problem. It no longer works even with the old ram. The computer was working perfectly fine before this.
Am i missin a step? I saw in a video on youtube that i have to reset the RAM with Alt+P+R+Power button, but nothing happens.
Please help, i am self employed and my Mac Book Pro is the computer i work with!
I have Lion operating system, everything updated very recently. Stock 512 gb hard drive.

Thanks for the quick reply Allan, i have reseated the ram 4 times, swapping top and bottom Ram modules, and pushing them in firmly and pressing down evenly with both hands.
I tried to put the old ram in as well in case the New RAM was bad, and that did not work anymore either. I am from Mexico and live in Mexico City, and it is not easy to send the RAM back and get an exchange. I will go to a MAC repair center on monday, but think i am missing some simple step somewhere. As i said this is my work computer and i really need it!
I have reread what i wrote before, to clarify my computer was working fine with the old 8 gigs of ram, i just wanted it to be faster, and bought 16 gb since they are now much cheaper than a few years ago.

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