Pc keeps turning on instead of shutdown

[Nesta_CZ]

Hello everyone, first of all, I apologize if this is wrong section for this, I'm not sure where to post this.

Now let's get to my problem, I recently build my new PC and since first time I turned it on, it won't poweroff, everytime I want it to turn off it just boots again, doesn't matter if I press switch on the case or I click power off in system it just turns on again. Only way of turning it off is flip switch on the PSU. This things happened even without HDD, I had just MoBo, GPU, CPU, RAM and PSU connected and it kept happening. I checked many times my connection of case buttons onto MoBo and it's fine.

I tried many things and I am out of ideas, I flashed BIOS, I have latest drivers, I replaced PSU and GPU, I turned off every Wake-on... function for network adapter, I checked BIOS for some stupid function and nothing worked.

So you guys are my last hope, I don't know what to do. I build PC myself so I can't RMA it, so please someone help me!

(sorry for bad english)

My specs:
AMD FX-6300
MoBo Gigabyte 970A-DS3P
Gigabyte R9 270 OC
2x4GB RAM
Eurocase ECO85+ 600W

 

[Protokal]

In your BIOS, you may have a setting that turns your computer back on after AC power loss. See if it is enabled and disable it.

 

[Nesta_CZ]

Yeah, I checked BIOS many times and it's set to off, Lan boot is also off

 

[1LiquidPC]

It could be a USB device causing it. If you have several plugged in, try removing one at a time and shutting down. One could be drawing power, such as a hub, causing your PC to turn on.

 

[1LiquidPC]

Also enable the "ERP" setting in bios. This should cut most standby/off power in case something is preventing shutdown.

 

[Nesta_CZ]

It could be a USB device causing it. If you have several plugged in, try removing one at a time and shutting down. One could be drawing power, such as a hub, causing your PC to turn on.

I unpluged every from USB, nothing changed. And in windows device manager I checked "Allow the computer to turn off this device to save power" for every USB port and also didn't help. I already tried both disabled and enabled ErP in BIOS

 

[1LiquidPC]

You mentioned it happens without having the HDD connected, so it's not going to be a Windows settings. Also, since you swapped out the PSU, was it the same model PSU that your using now? Since you disabled WOL, tried ERP, unplugged all USB, there's only a few things left. Tried 1 stick of Ram at a time to see if any change? If this doesn't help, I'd suspect something is wrong with either the motherboard or PSU. If the replaced PSU is the same model as before, perhaps it has some kind of odd compatibility with your particular motherboard. I don't recognize the brand itself, is it a basic unit?

 

[Nesta_CZ]

You mentioned it happens without having the HDD connected, so it's not going to be a Windows settings. Also, since you swapped out the PSU, was it the same model PSU that your using now? Since you disabled WOL, tried ERP, unplugged all USB, there's only a few things left. Tried 1 stick of Ram at a time to see if any change? If this doesn't help, I'd suspect something is wrong with either the motherboard or PSU. If the replaced PSU is the same model as before, perhaps it has some kind of odd compatibility with your particular motherboard. I don't recognize the brand itself, is it a basic unit?

Well, the other PSU was completely different, it was from my old PC, so I don't think it's causing it. And I tried 1 RAM at time without change. I think that MoBo is faulty, but I'm not sure.

 

[1LiquidPC]

Since the PSU was a different make/model, I think the only thing left is the motherboard. Not sure what else it could be. Don't think it will make a difference, but try another surge protector/wall outlet?

 

[Nesta_CZ]

I will try it tomorrow, because all wall outlets in my room were fried by my other PC and it's quite late now, but my other PC now runs fine from same outlet I'm currently using.

 

[Nesta_CZ]

Ok, so this didn't help. Could be RAMs causing it?

 

[1LiquidPC]

RAM that's defective or settings/voltage is incorrect can cause all kinds of weird problems. I'd say it's at least a possibly. I know RAM can cause sleep/hibernate issues if something isn't right, though your PC does this without a HDD connected if I remember correctly.

 

[westom]

Ok, so this didn't help. Could be RAMs causing it?

Start by first learning what contols power. A power controller takes many inputs (including from the USB, LAN, power switch, software) to decide when a PSU powers off or on. Your answer starts by first identifying what controls power. Then measuring, et al what are inputs to that controller.

Controller even decides when the CPU can execute.

One request to a controller to power off comes from the OS. Windows has a Hardware Abstract Layer so that one Windows can talk to many different hardwares. When an OS is loaded, it must first identify the hardware. Then load software appropriate for that hardware and power controller. Do you have the correct driver loaded?

Another input is the power switch. Holding that power switch for a long time is a message to the power controller to turn off the PSU. Does it? Also critically important are voltages (signal wires) between the controller and PSU. A meter is needed (or borrowed) to determine this using requested instrutions..

You have two choices. Just keep buying and swapping parts until something works. Or use the above information to request instructions unique to your symptoms. Those are your only two choices.

 

[Nesta_CZ]

Thanks for response westom, but I quite don't undestand what I should do, is that controller located on MoBo and how should I measure it?

 

[westom]

Thanks for response westom, but I quite don't undestand what I should do,

Again, the paragraph starts, "You have two choices." Decide which approach.

If selecting the second, then that above information (the third paragraph) says how begin. Resultng results will tell you nothing useful. But is the necessary and missing information so that others who know more can then provide a useful answer or suggest where to go for a solution.

 

[Nesta_CZ]

You didn't left much choice, so it's obvious which I should choose, but I'm not sure if I should mess with components. If you think that some part is faulty then I think I should claim warranty.