yosemite update computer will not boot

After upgrading to Yosemite on my MacBook Pro (early 2011) it worked well. I upgraded to an SSD and added more ram (4 to 8). The upgrade worked more speedily. With 10.10.3. I discovered the computer on reboot was beeping three times. I tried resetting and it would not boot. I safe booted and found that the RAM had a set problem. So I put the original ram back in . Still no boot up. I safe booted and tested the computer with Tech Tools 7. No problems but no booting. I suspect that there is something wrong with video settings so I reset the PRAM. Still nothing. What gives?? Do I take it in to the Genius Bar?