How I Fixed my MacBook Air 11.6″ Wake From Sleep Problems
After a bit of use, my MacBook Air 11.6″ started to exhibit a strange behavior, it refused to wake from sleep. I’d open the MacBook Air, hit every key imaginable, and the Mac just stayed asleep, nothing would get it to turn on. If you’re interested in this you’re probably affected too so before I talk a bit about the problem let me show you the fix that worked for me:
Select a Startup Disk in System Preferences!
Yea, that’s it. If you don’t know how to do that, here it is:
- Launch “System Preferences” from the Apple menu
- Click on “Startup Disk”
- Select the startup disk of the OS you are using (in my case, Mac OS X 10.6.7)
Say what? The MacBook Air isn’t booting though, it’s waking from sleep, why would this matter?
I don’t know, but it works. Maybe it’s just an issue with things being loaded from RAM and Mac OS X knowing where to get the data from, I don’t know. Now you might say my situation is unique because My MacBook Air dual boots between Lion and Snow Leopard, but upon looking at some friends Macs I discovered that even in a single boot setup, a startup disk is rarely selected. 99% of the time it’s probably not necessary, and I can’t explain why it is here, but it solved the wake from sleep problem immediately.
Now I’ll talk about the problem a bit and how I arrived at this. In the process of troubleshooting, I discovered a few things. First, I googled around and discovered I wasn’t alone, there’s a large thread on Apple Discussion Boards that has over 350 replies by MacBook Air 11″ owners complaining of the exact same problem. Interesting. Secondly, I discovered the MacBook Air actually is waking from sleep, the display just isn’t turning on. Thanks to the SSD, the machine runs so incredibly quiet that you would have no idea it’s awake, but it is. I discovered this because the Air was still available as a shared device on a local network, anyone could freely connect to it, move files back and forth, etc. After figuring this out I tried to adjust the brightness back and forth and that did nothing. Resetting the SMC worked for a short while, then it started up again. It wasn’t until I was trying to find out if the problem happens in both Mac OS X 10.6 and 10.7 that I discovered a Startup Disk wasn’t selected, each time I’d select a drive it wouldn’t happen. Thus, my fix was found, and maybe it will help you too.
Oh, and the default disk seems to reset itself when you use option to select a startup drive during boot, so look out for that too.