Please let me explain, as I do not think there is anything inherently wrong with this model. Having now had to do this repair twice, I am beginning to suspect that environmental conditions (temperature, ambient humidity) are directly affecting thermal paste on the Macbook Air (as least the Rev C). WARNING: You should do this ONLY you are an experienced repair person, and only if your computer is already out of warranty.įYI: I've been building, repairing and modding computers since 1987. 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. NEWS FLASH for MacBook Air users with 3 Beeps at startup!!!

Macbook pro 3 beeps no boot