Screen froze, purple lines, three beeps. Help!

Hello to everyone, I know this is super late but I had the same exact problem. I bought a MacBook Pro mid 2012 from eBay and I thought the person that sold it to me knew it had the problem but that was not the case. She had told me that one of the memory slots did not work and I forgot she told me that so I still put both memory sticks in the memory slots and my Mac started having the blurred lines, glitch and beep.So I contacted the seller if she knew of the problem and then she reminded me of the memory slot damage. So I went a removed the memory stick. and now my MacBook Pro 13 mid 2012 works perfectly! SO I BELIEVE THE CAUSE OF THIS PROBLEM IS A DAMAGED MEMORY SLOT. Hope this helps! Thanks!

Hello to everyone, I know this is super late but I had the same exact problem. I bought a MacBook Pro mid 2012 from eBay and I thought the person that sold it to me knew it had the problem but that was not the case. She had told me that one of the memory slots did not work and I forgot she told me that so I still put both memory sticks in the memory slots and my Mac started having the blurred lines, glitch and beep.So I contacted the seller if she knew of the problem and then she reminded me of the memory slot damage. So I went a removed the memory stick. and now my MacBook Pro 13 mid 2012 works perfectly! SO I BELIEVE THE CAUSE OF THIS PROBLEM IS A DAMAGED MEMORY SLOT. Hope this helps! Thanks!

Hello to everyone, I know this is super late but I had the same exact problem. I bought a MacBook Pro mid 2012 from eBay and I thought the person that sold it to me knew it had the problem but that was not the case. She had told me that one of the memory slots did not work and I forgot she told me that so I still put both memory sticks in the memory slots and my Mac started having the blurred lines, glitch and beep.So I contacted the seller if she knew of the problem and then she reminded me of the memory slot damage. So I went a removed the memory stick. and now my MacBook Pro 13 mid 2012 works perfectly! SO I BELIEVE THE CAUSE OF THIS PROBLEM IS A DAMAGED MEMORY SLOT. Hope this helps! Thanks!

Hello to everyone, I know this is super late but I had the same exact problem. I bought a MacBook Pro mid 2012 from eBay and I thought the person that sold it to me knew it had the problem but that was not the case. She had told me that one of the memory slots did not work and I forgot she told me that so I still put both memory sticks in the memory slots and my Mac started having the blurred lines, glitch and beep.So I contacted the seller if she knew of the problem and then she reminded me of the memory slot damage. So I went a removed the memory stick. and now my MacBook Pro 13 mid 2012 works perfectly! SO I BELIEVE THE CAUSE OF THIS PROBLEM IS A DAMAGED MEMORY SLOT. Hope this helps! Thanks!

Hello to everyone, I know this is super late but I had the same exact problem. I bought a MacBook Pro mid 2012 from eBay and I thought the person that sold it to me knew it had the problem but that was not the case. She had told me that one of the memory slots did not work and I forgot she told me that so I still put both memory sticks in the memory slots and my Mac started having the blurred lines, glitch and beep.So I contacted the seller if she knew of the problem and then she reminded me of the memory slot damage. So I went a removed the memory stick. and now my MacBook Pro 13 mid 2012 works perfectly! SO I BELIEVE THE CAUSE OF THIS PROBLEM IS A DAMAGED MEMORY SLOT. Hope this helps! Thanks!

Hello to everyone, I know this is super late but I had the same exact problem. I bought a MacBook Pro mid 2012 from eBay and I thought the person that sold it to me knew it had the problem but that was not the case. She had told me that one of the memory slots did not work and I forgot she told me that so I still put both memory sticks in the memory slots and my Mac started having the blurred lines, glitch and beep.So I contacted the seller if she knew of the problem and then she reminded me of the memory slot damage. So I went a removed the memory stick. and now my MacBook Pro 13 mid 2012 works perfectly! SO I BELIEVE THE CAUSE OF THIS PROBLEM IS A DAMAGED MEMORY SLOT. Hope this helps! Thanks!

Hello! This is very late but I'm experiencing the same problem. What I did upon knowing that my Mac won't function anymore (purple lines, froze, beeping sounds) was I had it checked in Apple Center here in the Philippines. Their initial diagnosis was a logic board problem (which costs at around 30,000 pesos here. too expensive!!!). I didn't push through with installing new logic board, and instead I had it reformatted. As of the moment, it's still on its normal state, but when I pressed the left side of the screen (because I was about to move the Macbook from the table to my bed), the purple lines started to show again, the screen froze and the laptop shut down on its own. After a few minutes, I turned it on, and now it functions normally without any glitches... I hope. What's the best solution for this? I don't want to spend so much money if I'm only going to experience the same thing, again and again.

Perform SMC and PRAM resets:

http://support.apple.com/kb/ht3964

http://support.apple.com/kb/PH14222?viewlocale=en_US

Perform a Safe Boot:

http://support.apple.com/kb/HT1564?viewlocale=en_US

What are the results? Any beeps or display aberrations?

Ciao.

Run an Apple Hardware Test and see if that produces any clue:

http://support.apple.com/kb/ht1509

Note that an error free AHT is not conclusive.

Ciao.

Make an appointment at an Apple store genius bar. The technicians have superior diagnostic tools at their disposal and are in a much better position to determine what are the problems your MBP is experiencing.

Ciao.

Picture Included. Mid 2012 13 inch Macbook Pro green/purple lines on screen. Freezes. Sometimes 3 beeps.

Is this the same problem you were experiencing?

I'm having this issue as well... Any luck?