Computer Keeps Turning Back On After Shut Down

[7heBoss]

Not sure where I should have posted this question but I am in a rush so I wanted to post it somewhere. I have a computer that has been functioning properly until a couple days ago when I switched to 2 Touch Screen Monitors opposed to my my old traditional monitors. Now whenever I turn off my PC it will immediately turn itself back on. its quite annoying. I am hoping to find a solution to this issue. Would anyone know?

They are Acer t232hl (or something like that) monitors and plug into my USB 3.0 ports in the back... Do I have to change anything in the BIOS now that I have them?... And I don't know if this detail is relevant, but during this reboot the screen prior to boot says "NO KEYBOARD ATTACHED!" and it normally never says that on a regular boot

thanks for the help

 

[VirtualLarry]

The normal reason for a PC powering back up immediately after shutdown, is because the motherboard is damaged, specifically the cmos register that controls power-on behavior. This can be due to abnormal power-supply fluctuations on the 5vsb (standby) line. This is also often the line that feeds the USB ports on a rig.

If you unplug the new touch-screen monitors from the USB ports, does it still do it?

 

[Burpo]

Turning off the monitors before the PC may also solve the problem.

 

[mfenn]

If something weird starts happening after you make a change, then you should suspect the change you made as a cause. I agree with Larry and Burpo, try unplugging and/or turning off the new monitors before turning off the PC.

 

[7heBoss]

Sorry, I had to go to work so I wasn't able to respond on this. I'll try and be brief but detailed.

I unplugged both the USB cables from the computer. I continually tested it by powering it on then shutting it down, repeat. I have done it at least 8 times and it seems to still power back on but not EVERY time. When I go to shutdown it will turn off but then it starts making noises as if trying to power back on, sometimes its seems to succeed and it boots up, sometimes it seems to fail and everything powers off.

So to be more detailed of the situation. I pretty much completely rebuilt my computer over the holiday season. Everything swapped out except motherboard and CPU... It all seemed to be functional and worked as intended, the monitors were the last thing to replace and that just seemed to trigger it but maybe its something else. Because even now, unplugged, it still seems to reboot.

So outside of a new motherboard, is there a fix? Besides this rebooting, I haven't encountered any other issues...

 

[XavierMace]

Sounds like your system is set to wake on USB.

 

[7heBoss]

Sounds like your system is set to wake on USB.

I don't really know what that means...

Yeah, I dont know if this changes anything. but besides adding the monitors, I did rearrange plugs in the back, using different ports for different devices. I wouldn't think this matters at all but i know a couple of my 2.0 ports are different colors for different reasons...

 

[7heBoss]

also. i upgraded from windows 7 to 8...

 

[phasseshifter]

your blue ports are usb 3 your others will be all usb 2 ..and often changing a device to another socket/port windows will reinstall the drivers for it.. aside from that go into your bios and find wake up event`s... these setting`s you can define a port to wake up the system..set them to disable only these don’t mess with any thing else..pls

 

[pcgeek11]

Check the BIOS and turn off Wake On USB.

Also:

Hardware
USB devices are common causes for computers waking prematurely. In the case of accidental mouse activation, consider laying the mouse on its back until you find a better solution.

To troubleshoot the Sleep Mode problem visit the Device Manager
1) Control Panel --> System and Security --> System --> Device Manager.
2) Right click the suspect device
3) Properties
4) See if it has a Power Management Tab.
5) If so, then remove the tick next to: 'Allow this device to wake up the computer.

Hardware Example: The Network adapter --> Advanced menu
Select: 'Wake up capability'. Choose 'None'.

 

[7heBoss]

I assume these "Power On" events on my Asus bios are the same as your "Wake On" events. (I couldn't find "Wake On" anywhere) That having been said, there is no "Power On USB"... I have things like Power on PS/2 Keyboard, Power on PS/2 Mouse, Power on PCI, but no "USB".

These alternate colored USB Ports that I am referring to are Red. I understand Blue is USB3, Black is normal USB2, and from what I have heard, Red are for extra juice USB2... I just leave those empty.

Maybe tomorrow I'll try resetting CMOS and see where that gets me

 

[Puffnstuff]

Look in the power settings in your bios. You have to disable all "wake on" events in order to keep the system from powering back up on its own.

 

[VirtualLarry]

also. i upgraded from windows 7 to 8...

This may have something to do with it. When you select "Shutdown" in Windows 8, it doesn't actually power off. It writes something to the hibernate file, then goes into a low-power sleep state. This is to allow it to boot up faster.

 

[Termie]

This may have something to do with it. When you select "Shutdown" in Windows 8, it doesn't actually power off. It writes something to the hibernate file, then goes into a low-power sleep state. This is to allow it to boot up faster.

I believe you have to manually enable this feature in the UEFI. This wouldn't work in most situations where a desktop's surge protector is shut off regularly.

Also, suggestions above about Windows wake-on settings aren't quite right. This is not a Windows issue, it's a UEFI issue. The system is already off - the OS has no effect on the PC at that point.

 

[lucklessgorath]

Run Command Prompt. (Start menu -> Run -> [type] CMD ->[Enter])

In the Command Prompt window [type]: powercfg -lastwake [Enter]

This is supposed to tell you what woke your computer.

 

[lucklessgorath]

In my experience I've had trouble with Realtek NIC waking my computers which wasn't being reported by powercfg. I found a fix.

Start menu -> Control Panel -> Device Manager -> Network adapters -> [right click] properties on realtek NIC -> Advanced Tab -> Wake on Patten Match -> Disabled

 

[Ketchup]

As I read through this thread, I can't help but wonder if it has something to do with the USB 3.0 connection, especially if the USB 3.0 port isn't on the Intel/AMD controller. You said that you were originally on Windows 7, which could put it in the timeframe of third-party manufacturers being used for the newer connection interface.

We could know more if we knew what computer/motherboard you have, but for the time being see if plugging it into a USB 2.0 port solves the issue.

 

[sm625]

Open a command line and type/paste:

shutdown /s /f /t 0

No windows or BIOS setting should be able to cause the computer to turn back on on its own when shut down in this way. It should be OFF. Not asleep. Not hibernating. Just OFF. Period. Does that command cause the pc to shutdown and stay should down?

 

[riahc3]

Some of the suggestions here are have nothing to do with the issue.

The issue is that in your UEFI setup, you have wake on USB. That needs to be disabled because for some odd reason you monitors seems to be waking up your PC.

Also, I agree, search your event log; It will tell you what woke up your PC.

 

[mfenn]

Open a command line and type/paste:

shutdown /s /f /t 0

No windows or BIOS setting should be able to cause the computer to turn back on on its own when shut down in this way. It should be OFF. Not asleep. Not hibernating. Just OFF. Period. Does that command cause the pc to shutdown and stay should down?

:thumbsup: This is a good thing to check. In Windows 8, the "power button" doesn't have clear text explaining what it does like it did in Windows 7, and defaults to sleep. (I guess because it wants to be mobile focused?)

 

[7heBoss]

All the Power on settings in the BIOS were already disabled. I had changed some other settings in the BIOS last night, i can't even recall what it was exactly. But I powered off my computer twice today with no issues. The only inconvenient thing i've noticed is that when i power on it says NO KEYBOARD ATTACHED so i couldn't get back into the BIOS at this moment. hopefully i dont need to get in there any time soon

 

[VirtualLarry]

That is further evidence of problems with the 5Vsb line on your PSU.

 

[westom]

The only inconvenient thing i've noticed is that when i power on it says NO KEYBOARD ATTACHED so i couldn't get back into the BIOS at this moment. hopefully i dont need to get in there any time soon

All those recommendations are inputs to one device that determines when power goes on or off. This power controller takes all those inputs and many others to determine if a system can power on, when the CPU can execute, and when power is removed. Inputs include and are not limited to front panel switch, power supply status, BIOS contoled settings, some AC line anomalies, 5VSB, temperature, fan operation, and those wakeup features.

Curious is a problem that only occurred with the Windows 7 to Windows 8 upgrade. Remember, most computer hardware is different. Windows must determine which hardware exists. Then install unique software in a hardware abstraction layer to customize Windows for that unque type of hardware. Possible that Windows was confused by some new design or some defect and loaded wrong software into the abstraction layer.

To say more starts by measuring some key voltages on six wires. The value and behavior of those numbers says so much about what the power controller sees and is doing. Currently your many answers are only try this and do that. Establishing a few hard numbers goes a long way to exponentially reducing confusion by elminating some variables.

BTW hibernate is not a shutdown. And hibernate does a completely power off - does not leave a machine in a low power states. If in a low power state, then disconnecting or installing parts can create hardware damage.

Remember, power cycling is only performed by one central piece of hardware. Only that power controller tells a PSU when to power off or on. That controller not only runs independent of other computer system. It even says when your computer's CPU is permitted to work and access the BIOS and CMOS.

 

[mfenn]

All the Power on settings in the BIOS were already disabled. I had changed some other settings in the BIOS last night, i can't even recall what it was exactly. But I powered off my computer twice today with no issues. The only inconvenient thing i've noticed is that when i power on it says NO KEYBOARD ATTACHED so i couldn't get back into the BIOS at this moment. hopefully i dont need to get in there any time soon

Do you happen to have your keyboard plugged into a USB 3.0 port?

 

[JackMDS]

I had one time a short in a USB 2.0 jack (one of the pins got dislodged and short), it resulted with the same behavior (Win 7 was the OS)

I am not saying that you have the specific problem that I had but it might indicate some type of short in the hardware that affects the behavior of the PSU.