Sleep and waking mode worked perfectly until a few months ago. I suspect Windows updates.

danclo

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Feb 16, 2015
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My sleep mode worked perfectly for sleeping and waking until a few months ago. Many Windows 7 updates since then so I am suspicious. Now after sleeping for more than a few hours will not wake via my usb keyboard. I must use the Power button to wake the computer. All is OK after waking. I have tried every Power Option anyone has suggested and every device manager configuration I have seen online which is hundreds of suggestions by knowledgeable folks. Still no wake from a sleep of a few hours. Short sleeps of an hour or less work perfectly.