This thread has become a dump for MacAir 3 beep solutions so here's my addition: I worked through the following non-invasive techniques (most listed above) a couple times each and after doing 5) it started booting. Maybe they worked as a combination or maybe it was 5 that did the trick. If none of these had worked I'd have tried the Thermal Paste solution above. However, if non-invasive works, who am I to complain! Hopefully this compilation helps someone!
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UPDATE: This happened to me a second time two months later: I have found a firm fix for my issue now:
1) power off, plug in power cord
2) Hold (left side) command + (left) option + P + R
3) while holding them, tap power and CONTINUE HOLDING the four buttons in 2
4) Computer will make a startup sound, KEEP HOLDING, computer will turn off, KEEP HOLDING, computer will startup again, you can let go only AFTER the second startup or even third startup.
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These are other things I tried the first time around:
1) "Hold Command+P+R simultaneously and press power button" (Pedro above)
2) Technique 1 followed by "hold D and power for 20-30 seconds" (relveston above)
3) "Holding down D for about 20-30 seconds -- and power simultaneously -- Then press power " (textractor above)
4) Perform SMC reset and re-verify
Shut down the computer.
Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected.
On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.
Release all the keys and the power button at the same time.
Press the power button to turn on the computer.
Note: The LED on the MagSafe power adapter may change states or temporarily turn off when you reset the SMC. (PlotinusVeritas from Apple help forums)
5) Shut down your Mac.
Locate the following keys on the keyboard: Command (⌘), Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys. (PlotinusVeritas from Apple help forums)
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Hi. What I did was to heat'it up with a hot air solder station. It work well but when I employ hi memory demand applications, the computer stops and when I restart it , the 3 beeps again. The 4 time it happens to me, I messed, because I put to much air in the soldering gun, and one of the memory chips just loose. Pretty bad!!
I'm on it, trying to align the chip correctly again. When it happen, and I can start again I will do 2 activities:
1. Beaked as recommended.
2. Restore Memory frecuently.
von Paulo César Cardona
Try this. I had the dreaded Three Beeps of despair, but sit commenting on this post using the same Mac book Air. Mine turned out to be excessive dust inside the case, which must have been tracking across circuits somewhere.
Be super careful and super clean, earth yourself prior to and during the work.
Remove the back cover of your Mac Book Air. You will need the correct tool for this, cheap enough. Remove the battery. Get the vacuum cleaner out, and find the small attachment for it, and hold it close to, but not touching the components in the Mac. At the same time use a brand new, ultra clean make up brush or photographers lens brush, to dislodge and clean away the years of grot, biscuits and dust. Be careful and slow. Refit the battery and back cover and try to start the machine again. Mine worked a treat and has been for 3 months since the work. Mid 2013 Mac Book Air.
von rogerbateman