If you can't get to the power setting...because it is in power save mode...do a hard restart. Hold the power button in for a few seconds until the computer turns off. Then turn it back on again. Once restarted, then set you power options as others have stated.
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If you can't get to the power setting...because it is in power save mode...do a hard restart. Hold the power button in for a few seconds until the computer turns off. Then turn it back on again. Once restarted, then set you power options as others have stated.