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Dell Inspiron N5110 does not go into sleep mode, loses power
When I try to put my Dell Inspiron N5110 laptop into sleep mode, the screen goes dark and it looks like it's going to sleep. But the power button stays lit, and the two small outer edge lights on the front display stay lit. I can hear the motor whirring too, and it's clear the laptop is actually on and using/losing power. I am unable to get it out of sleep mode. A long press of the power button will get the computer powered up, but I am immediately taken to the "Windows did not shut down correctly" screen, and given the option to start windows normally or in safe mode.
To fix the problem, I've tried doing a system restore to a restore point before the problem started. That didn't fix it. Today I scanned the hard drive, motherboard and various other hardware, and everything passed. I did a virus scan and no threats were found. Any ideas what's going on and what I can do to fix the issue?
Specs for the laptop: Windows 7 Home Premium Service Pack 1, 64 bit, 6 GB RAM, Inter Core i5.