3 beeps at startup
my macbook pro mid 2012 15.4 does not start and beeps 3 times at statup
2010年4月発売。2.4, 2.53 GHz Core i5 or 2.66, 2.8 GHz Core i7プロセッサ
I have the same issue as well with a MBP Mid-2012 model Intel Core i7 2.9GHz with 2 4GB RAM. Sometime the screen will glitch and I will see artifacts on the screen. Other time it will suddenly shut down and then beep 3 times when I try to turn it back on. Usually I have to open the back cover take out the battery and reinstall the RAM for it to turn on again. I recently noticed that if I apply pressure on the bottom of the laptop or if I move it will start having problems. I tested it with one RAM in the top slot and it is now working fine. I moved it, applied pressure, tried having multiple applications open and it did not give me any problems. Hopefully this fixes your issue.
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