Therefore, if you have recently had a MacBook Air exhibit the 3 beep boot failure, strongly consider checking your thermal paste. Rebooted and NO 3 beeps! Once again, my MacBook Air appears to be working perfectly. I then removed the heatsink I found the thermal paste dried and hardened! I carefully removed all of the old paste and then applied new high quality thermal paste.
Nothing else appeared burned, fractured, loose or disconnected. When I got down to the logic board, I inspected the 8 visible 1 gigabit chips visible.
Made no sense that DRAM of any sort would fail after 15 months. On a hunch, as I have noticed my MacBook Air has overheated in the past, I opened mine up to check the THERMAL PASTE. mid-2012 cMBP 16GB ram 500GB apple SSD 10.8.NEWS FLASH for MacBook Air users with 3 Beeps at startup!!! After, making sure the plug was tight i was able to run both the basic and extensive hardware test both came back with no problems. something strange also is, i guess when the cable was loose?(hope that was the problem) i was not able to the apple hardware test at boot, it would start and just freeze and my computer would get very hot. It has been 3days now and have since updated to 10.8.5 and have not experienced any problems. So i blew air in the contacts plugged unplugged and plugged in again and wadded a little piece of paper onto the top off the plug to help keep it in place. so i checked my hard drive cables, hard drive side seemed fine but, the logic board side seemed loose,i say seemed loose because it came off with no effort or "plug" feel. something strange i noticed though was i bumped my desk a little and it caused the screen to freeze and not boot only the 3beeps i thought that was strange since i have a apple SSD. i taught maybe it was due to the 10.8.5 ML update so i restored from a time machine backup back to 10.8.4 seemed to work fine for a few days then same problem.
tried changing ram (aftermarket and stock) seemed to be working fine then same problems with both ram. Had a similar problem, three beeps, freezing, not able to boot, then all of a sudden working fine.
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