this seems to work with my tv when it doesn't turn on, so give it a shot, if you can

take out the battery for like 25-30 seconds and put it back in... idk if the maccbook airs battery is easily reached or not

[quote|Skippy722]this seems to work with my tv when it doesn't turn on, so give it a shot, if you can take out the battery for like 25-30 seconds and put it back in... idk if the maccbook airs battery is easily reached or not[/quote]

Been there done that. Had the battery out - had battery only - no joy either way,

[quote|machead3]Been there done that. Had the battery out - had battery only - no joy either way,[/quote]

google?

[quote|Skippy722]google?[/quote]

Simply boot from your external MacBook Air SuperDrive by holding down the "C" key with a system DVD in the drive, then use Startup Disk and then Disk Utility to diagnose the issue.

If no success, do same holding down "D" to boot from the hidden AHT diagnostic partition. Run the hardware diagnostic from this partition

If still no success, try booting from a USB 2.0 hard drive (of course, the drive must have a clone or other OS X install on it; a Time Machine backup won't work) by holding down the option/ "alt" key. You may have to hold the key down for a while; then select which drive to boot from. Least likely to work but worth a mention is using Remote Install from another computer.

Sounds like you likely corrupted the parameter RAM (a.k.a. NVRAM) - which contains startup disk information - by removing the battery, especially if it had run down completely at any time. So you could also try command-option-P-R to reset the NVRAM.

Here are all the startup key key combinations for Intel-based Macs:

http://support.apple.com/kb/HT1533

[quote|Matt3141]Simply boot from your external MacBook Air SuperDrive by holding down the "C" key with a system DVD in the drive, then use Startup Disk and then Disk Utility to diagnose the issue. If no success, do same holding down "D" to boot from the hidden AHT diagnostic partition. Run the hardware diagnostic from this partition If still no success, try booting from a USB 2.0 hard drive (of course, the drive must have a clone or other OS X install on it; a Time Machine backup won't work) by holding down the option/ "alt" key. You may have to hold the key down for a while; then select which drive to boot from. Least likely to work but worth a mention is using Remote Install from another computer. Sounds like you likely corrupted the parameter RAM (a.k.a. NVRAM) - which contains startup disk information - by removing the battery, especially if it had run down completely at any time. So you could also try command-option-P-R to reset the NVRAM. Here are all the startup key key combinations for Intel-based Macs: http://support.apple.com/kb/HT1533[/quote]

Matt - the power button does nothing.

[quote|machead3]Matt - the power button does nothing.[/quote]

Sorry - I didn't understand that the power button was actually just plain broken. You need to have physically repaired, as it is simply a hardware issue. Your terminology confused me - "won't boot" is quite different than "won't power on."

However... if you have a external USB keyboard from one of the first or second generation iMacs with a power button on it, plug that in and try it. (I vaguely recall that possibly, Kensington also made an aftermarket USB keyboard with a power button also, but I've only seen the ADB ones.)

That trick has worked for me several times in the past, but I doubt that it'd work with something so much newer. It's certainly worth a try, though, if you can find one.

[quote|Matt3141]Sorry - I didn't understand that the power button was actually just plain broken. You need to have physically repaired, as it is simply a hardware issue. Your terminology confused me - "won't boot" is quite different than "won't power on." However... if you have a external USB keyboard from one of the first or second generation iMacs with a power button on it, plug that in and try it. (I vaguely recall that possibly, Kensington also made an aftermarket USB keyboard with a power button also, but I've only seen the ADB ones.) That trick has worked for me several times in the past, but I doubt that it'd work with something so much newer. It's certainly worth a try, though, if you can find one.[/quote]