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E6410 when I hit sleep will black the screen and show HD and wifi lights indefinitely. Never gets to sleep. Have to power off and on.
This seems to be affected by Dropbox; when I disable it before hibernating or sleeping, it goes down just fine...
It's Dropbox, as far as I can tell. I found this on a dell forum as a batch file you can run to hibernate the computer:
taskkill /f /im Dropbox.exe /t
Required, but never shown