Elitedesk 800 G5 won't boot from sleep mode

[David638]

My Elitedesk 800 G5 will quite often not boot up after being in sleep mode overnight. 

The LED in the power button flashes once per second. If I press any key on the keyboard nothing happens (the NumLock LED might flash briefly).

I have to press and hold the power button for 5 seconds to force a shutdown.

The PC was shipped with 8GB of RAM (single DIMM). I've replaced it with 2 x 16GB DIMMs. I've swapped the original RAM back in and the problem still occurs. Also, sometimes I will find the PC's internal fans running at full speed during the night, after the PC has been left in sleep mode.

I have the lastest BIOS and drivers, all downloaded via the HP Support Assistant.

The PC operates perfectly otherwise.

[WAWood]

@David638 

Win10 has enabled a new hibernation process known as Fast Startup -- which is enabled BY DEFAULT. This is different from Fast Boot, which is a BIOS/UEFI option.

Fast Startup is supposed to dramatically speed up the booting process, but in some PCs, it actually slows it down or causes it to hang. It's also a new form of hibernation known as hybrid sleep -- and this causes battery drain to maintain the state of the PC while turned off. In some rare cases, it can also cause a laptop to overheat because the processor is still running and still generating heat, as this has been reported when the laptop was turned off and put inside a case.

Disabling Fast Startup might fix booting and shutdown problems.

There are two ways to disable FastStartup in Win10: (1) through the Control Panel, and (2) through an elevated command prompt.

Control Panel - Open Control Panel --> Power Options.
Select "Choose what the power buttons do"
Select "Change settings that are currently unavailable"
At the bottom of the Window, under Shutdown settings, uncheck the box regarding fast startup

Elevated command prompt - run the following command:
REG ADD "HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\Power" /V HiberbootEnabled /T REG_dWORD /D 0 /F

In both cases, reboot Windows.

NOW, Fast Startup is disabled.

See if that helps.

[David638]

Hi WAWood,

Thanks for your suggestions.

Strangely, the 'Turn on fast startup' option is not shown, however I ran the command line you provided and got  confirmation that it had disabled the feature.

I've rebooted and put the PC to sleep a few times and it has woken up fine everytime. The real test will be after it has been in sleep mode overnight.