My Precision 3510 will not sleep or hibernate regardless of how I attempt it. If I click start, power, sleep, it just powers off. I've set the Lid Close mode to sleep when on battery and it just powers off. I've set it to go to sleep after 20 minutes when on batter, and it just powers off. I've looked at the BIOs and sleep mode, or whatever it's called, is enabled. I've run throught the FN diagnostics and they show no issues. This is running Windows 10 that is fully up to date on patches, and the firmware/BIOS on the laptop is completely up to date.
How do I get this thing to sleep?