In the Device Manager window, locate the device you want to prevent from waking your computer. It will have the same name as it does in the output of the powercfg command you just ran. Right-click the device and select “Properties” from the context menu. You can save energy by putting your Mac to sleep when you're not using it. When your Mac is sleeping, it's on but consumes less power. And waking your Mac from sleep is quicker than starting it. Meet “Sleep Mode,” part of the all-new Avast Cleanup Premium. In this blog, we’ll examine the impact of third-party applications on typical PCs and how Sleep Mode makes a marked difference. In essence, Sleep Mode detects which programs are slowing your PC.

When I am putting the laptop to sleep I always do that by closing the lid This works all the time as long as I remember two very important steps: 1. Remove the USB mouse before closing the lid 2. Do not insert the USB mouse before the computer is started.

This works without a hitch on my MacBook Pro and also on my PowerBook (Titan) before! If I am not following the steps above, different things can happen after sleep: - Black screen!, but usually it continue the start up after a while - The log in prompt comes up twice [ ]. I usually have my MacBook and Powebook hooked up to external monitors and I too have had the problem when I sleep the computer, disconnect the monitor and then reawaken the computer all I get is a black screen. Unfortunately there are a couple of reasons this can happen, and each has its own solution.

• Already mentioned on this site is to reawaken your computer without the power cord plugged in. • Also already mentioned is if you awaken your computer and you get a black screen, tap the powerbutton once (which brings up Shutdown dialog box, though you can't see it) and then press the 'S' key, which will sleep the compuer and try reawakening. This frequently solves the problem. • Lastly, if you have slept your newer-Powerbook or Macbook (standard or Pro) and while it was writing the contents of the memory to disk (ala Safe Sleep) unplugged firewire or USB devices you may have corrupted a preferences file. My guess is it is the Energy Saver or Display.plist file, but I don't know for sure.

When I had the black screen on my MacBook and solutions 1 and 2 weren't working anymore, I didn't have time to troubleshoot and locate the exact corrupt.plist. I didn't narrow the problem down to either a. Hardware problem or b.plist problem so I did an archive and install to determine a or b and the problem has vanished. So I am guessing it was b. But that is a very good guess.

• Download the Avast Security for Mac setup file by clicking the button below and save it to a familiar location on your Mac. • Click Quit. • Double-click the downloaded setup file avast_security_online.dmg and select Uninstall Avast. Avast free antivirus for mac user agreement.