Solve MacBook power problemsResetting the System Management Controller can help solve a number of power-related problems like sleep in your MacBook.
>> Tom: Any of the following could be truly annoying in your MacBook: battery won't charge, power adapter doesn't work, or my personal favorite, the Mac won't go to sleep or at worst it won't even wake up. I'm Tom Merritt from CNET.com I'm gonna show you how to solve some of these power annoyances. ^M00:00:13 [ Music ] ^M00:00:21 >> Tom: First try a basic restart click on the Apple in the menu bar and select restart if the computer won't restart try the following: use option command, escape to quit and programs that may be stalled. Press control, command and the power button to force a restart of the machine or if that doesn't work force a shut-down by holding the power button down for 10 seconds. Once you've restarted the Mac see if you're still having power problems if you are here's a last ditch trick you can use on an Intel-based Mac to try to fix your Mac's sleep or other power management problems and thanks to Joey, Joey, Joey in the CNET fans IRC Chat Room for this one. First shut down the system entirely, use the power button trick if you need to then unplug the power and remove the battery. Got a MacBook Air or a 17 inch MacBook Pro, yeah they don't give you an easy way to remove the batteries on those we'll get to you in a second. Once you have the batter out press and hold the power button for 5 seconds and then release it, reconnect the battery and the power and power on the computer, hopefully that fixed your problem. Now if the battery doesn't come out on your particular Mac you still need to turn the MacBook off but make sure your power adapter is connected this time and plugged in. On the keyboard press the left option, left control and left shift along with the power button all at the same time. Only use the left side buttons not the ones on the right. Wait 5 seconds then start the computer back up, and there you have it. If the problem was unstable settings in the system management controller they should be fixed now. Now a word about sleep issues before you resort to the power management remember the connections can prevent the MacBook from going to sleep. Bluetooth connections, network connections like file sharing and even just playing music or DVD's can interrupt sleep. My MacBook Pro wasn't staying asleep because my EVDO card was in the slot and it kept checking the network connection interrupting the sleep. See our quick tip on sleep problems for more info on troubleshooting the Mac sleep issues. That's it for this Insider's Secret, I'm Tom Merritt CNET.com. ^M00:02:31 [ Music ]