I have an HP PC, that is running Windows. After a power loss, the computer turns back on, and I want to disable it.
I tried the BIOS, and the setting of "After Power Loss" is already Off (see image). I also tried changing that setting to On but that still made the computer turn on after a power loss.
How can I set my computer to not automatically power on after a power loss?
EDIT:
- BIOS updated to latest version
- Boot after power loss:
Off - Network boot:
Off
- Boot after power loss:
- Replaced the CMOS battery
- Tested even with no USB devices, just VGA and Power
Testing fashion: Turn on, pull the power cord, plug the power cord. Wait 2 seconds, then it boots again.
Still no luck.
Edit 2
If I unplug while running, then wait 5 minutes, then plug again, it does not boot until I press the boot button. What is going on?
85 Answers
Option #1:
In your bios you should have a 'power on by RTC' and 'Power on by pcie', have you tried disabling those? I believe they should be disabled by default.
Option #2:
Install and Configure a UPS Software
Step 1: Install PowerChute or similar software.
Step 2: Navigate to the Energy Management tab or similar within the Configuration setting.
Step 3: Check the Enable Energy Management checkbox and choose the Default settings in PowerChute. Look for any "Turn On Again" settings in any other power management software and check/uncheck as appropriate.
Option #3:
Option #4:
The .reg files below are for the registry key and value below.
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\CrashControl
AutoReboot DWORD
0 = Disable
1 = EnableOption #5:
In command prompt enter the following:
wmic recoveros set AutoReboot = FalseTry checking your Wake on LAN settings in your BIOS and OS (in this case Windows). I have found sometimes my computer would wake after being turned off because the implementation of Wake on LAN would trigger even if the device just received a directed packet towards it.
Though it might not relate to specifically the same HP computer as the one you have (or even the same version of Windows), you might find the article HP PCs - Computer Turns On Unexpectedly (Windows 8) useful.
As with most un-intended behaviour I'd also suggest updating the BIOS just in-case it was a known bug.
8Briefly, how are you testing this? I think the best way would be to power off the PC from windows and then unplug the PC. Hit the power button once or twice with while its unplugged to clear the capacitors. Then plug it in.
Does it power on immediately?? If so it has to do with the "After Power Loss" BIOS setting. If it powers on after a few moments or minutes it could the NIC or USB device waking the PC.
Also, is there a "Last State" option for "After Power Loss"? That setting puts the PC back to the last "State" it was in when it lost power- so if it was already powered down it would be the equivalent of setting it to "Off". Perhaps that option will function correctly since the others don't seem to?
1You could check in the BIOS for an entry for Advanced Power Management or ACPI with an option like Restore from AC power loss.
If that does not help, start a Command Prompt (cmd) that is Run as administrator and enter :
bcdedit /set {default} bootstatuspolicy ignoreshutdownfailuresFor more information see the Microsoft article BCDEdit /set.
2on HP pc simply turn off "wake on keyboard button" save, re-enter bios its not greyed out anymore.
(i just make an account just to answer it. LoL)
