Category Archives: Power
If you see a screen with a progress bar (something like the shot above), your Mac is starting up in Safe Mode. This shouldn’t happen unless the user intentionally wants to do so for troubleshooting purposes. However, if you find that your Mac is defaulting to Safe Mode when you try to start up normally, try the following tips.
1. Stuck Shift key
Check that the Shift key is not accidentally being pressed down or stuck. If you suspect the keyboard may be faulty, plug in a different keyboard.
2. Use Terminal to reset boot-args
Allow the machine to finish booting into Safe Mode, then open Terminal (Applications/Utilities/Terminal.app) and copy this command into the Terminal window:
sudo nvram boot-args=""
press ‘return’ on your keyboard. Enter an Admin password (type carefully as it will not be echoed to the screen) and restart the Mac.
3. Do a PRAM reset.
In this case, a PRAM reset effectively does the same as No.2 above. However, if No.2 didn’t work, it’s worth trying this way of doing it in case for some reason the boot memory failed to hold the preference setting. You can also do this step instead of Step 2 if you are not comfortable with using the Terminal.
The PRAM reset is done like this:
1. Power down the machine.
2. Locate the following keys on your keyboard in preparation for Step 4:
3. Press the ‘power on’ button.
4. Immediately – and before the grey screen appears – hold down ‘command-option-P-R’ all together.
5. Keep them held down until you’ve heard the start-up chime twice. After you release them you should hear it again, and hopefully your Mac will boot up as it should normally.
Here’s a couple of tricks you can use to eek a bit more life out of your old battery between recharges.
1. Turn off the keyboard backlights by pressing F5.
2. Turn off Bluetooth in the menu bar.
3. If you’re not using the Internet, turn off Wifi in the menu bar.
4. If you are using the internet, but you’re not expecting or bothered about receiving mail for a time, quit Mail or any other email client app. If you still want to check your email and you use a web-based mail service like GMail, you’ll use less battery power if you quit Mail, and open GMail directly in your browser window.
5. Reduce the hard disk drive sleep time (formerly known as ‘spindown’). By default, your Mac will power down the hard disk after 10 minutes inactivity on battery power. You could try setting that to 5 minutes (any less, and you’ll probably lose what you gain as the the HD will end up having to power up more often than necessary).
To do so, open Terminal, and copy/paste this command:
sudo pmset -b disksleep 5
After pressing ‘Return’ on your keyboard, you will need to enter your password, which will be invisible when you type it (so type carefully).
If you want to change it back to its default anytime in the future, just use the same command but change the ’5′ to ’10′.
This doesn’t affect the spindown time when you’re on mains power.