HP Pavilion dm4-1065dx
My laptop wouldn't come out of sleep mode.
I might have plugged in a USB hard drive when it was in sleep mode and that may have caused the problem, I'm not sure.
"Some devices such as SD cards, USB devices, or other peripherals can prevent the PC from going in and out of Sleep and Hibernate."
fixed the problem.
1. Disconnect all peripheral devices and remove all USB devices and SD media cards.
2. Disconnect the AC power adapter, remove the battery, and then press and hold the power button for at least 15 seconds to drain all residual power and restore default startup settings.
3. Reconnect the AC power adapter (but do not insert the battery), press the Power button.
UPDATE: Same problem again. Trying to figure out the cause. I moved the laptop while it was in sleep mode and that may have caused it? I have a USB wireless mouse. Don't know if that has anything to do with it.