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. Unlike the first time, I never found anything I could see, but this seemed to fix it for me.NEWS FLASH for MacBook Air users with 3 Beeps at startup!!! Try cleaning out the problem socket with a small, stiff, clean paintbrush. Does the beeping come back? It may be fine for some while depending on how long you have been on battery power. Does the beeping stop? If the computer is thinking it is swapping from the power supply to the battery and back again, this ought to fix it in one state.Ĭheck the plug looks clean. However, there were some clues that pointed to something connected with the power. My current macBook-Pro does not have a magnetic power cable.
I eventually traced the problem to a small metallic fragment that had got stuck in the magnetic socket. This was doing roughly the same thing, and the reset commands were not helping. I had an old MacBook-Pro with the magnetic power plug. I am writing my solution here, so I can find it again if it happens a third time. This solution may not cover all cases, but I have seen it twice.
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