09-27-2015 01:50 PM
After an upgrade to Windows 10, my HP Compaq 6005 Pro Small Form Factor will not wake up properly from sleep. After sleep, if I press a key on the keyboard or press the power button, I hear the fan and hard drive start up, and the monitor goes from completely off to on yet black (I can see a small difference, and the monitor reports that it receives a signal). But nothing happens, including if I press various key combinations such as those which would cause rebooting. Sometimes my mouse pointer is visible but usually not. If so, it will not move. If I hold down the power button, killing the power supply, and the press the power button again, the computer wakes up (not rebooting).
As a history, this machine had a clean Windows 7 install, then a Windows 10 upgrade, then a Windows 10 clean install.
I have a vague memory that the computor originally went to sleep and woke up OK a few times, and now doesn't. However, my memory could be wrong.
I have tried:
* all Windows updates
* using HP website for all relevant updates, including BIOS
* display adapter (graphics card) update
* Windows Power Usage Troubleshooter
* turning hibernation off and on again in the command line (powercfg /h off and on)