![]() On a hunch, as I have noticed my MacBook Air has overheated in the past, I opened mine up to check the THERMAL PASTE. Loosen the 4 screws mounting the RAM holder slot a bit. Press and hold the power button so the fan goes off. On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time. Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected. Made no sense that DRAM of any sort would fail after 15 months. If any of your RAM goes undetected, also the chime doesnt happen and the only sound is of 3 concorrunt beeps then: 1. 3 beeps means your RAM is bad on your logic board Perform SMC reset and re-verify Shut down the computer. When I got down to the logic board, I inspected the 8 visible 1 gigabit chips visible. Nothing else appeared burned, fractured, loose or disconnected. 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. Rebooted and NO 3 beeps! Once again, my MacBook Air appears to be working perfectly. ![]() Therefore, if you have recently had a MacBook Air exhibit the 3 beep boot failure, strongly consider checking your thermal paste. ![]() 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. I pressed the power button until it was quiet. Intel Mac :: Turns On But Just Beeps Three Times Stops Beeps More Times And Wont Start Up I waited ten minutes and did some quick research on my ipod. The other one is when you can perceive some response from your Mac, such as MacBook Pro shows a black screen with chime, MacBook screen goes black after a few minutes of booting, MacBook Pro screen is not working but keyboard lit, etc. 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). My Macbook Pro battery had run down (it does quite a bit) so I rebooted with the power inserted. You must be wondering about the causes of the black screen issue on a Mac such as a MacBook Pro. Please let me explain, as I do not think there is anything inherently wrong with this model. ![]() Each time I have run into the 3 beep scenario, it has occurred after the MacBook Air has been exposed to extremes in temperature. Specifically, it has been left out in the center console of my 2007 Tundra when it has been very cold (10º F to 20º F).
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