PC startup problem

[NoKeR]

Hello, I will summarize the problem with turning on the computer as best as I can.

As a general rule, I have the habit of also turning off the rear button of the power supply when I turn off the computer, well, the problem comes when I turn it on again, I press the PC power button and it doesn't turn on immediately, it makes a pretense of turning on, turns off and immediately turns on again without touching anything (this always happens), this already left me a bit annoyed, but the strange thing came after, since even leaving the power button on, the failure occurred but very rarely, most days the computer turned on perfectly.

I bought the computer from pccomponentes, it has less than a month of use, so it is still under warranty. I spoke with the technical service about the problem described above and they said it was not normal, that it could be a failure of the power supply or the motherboard, that I send the PC and they would look at it. Well, in the end, ACCORDING TO THEM, they changed the power supply and now the computer worked perfectly.

My surprise comes from receiving the PC today, it turns out that it does the same :facepalm:, although for now it has only happened to me when I turn off the power button of the power supply and turn it on again, for now if I leave the power supply button on the PC turns on correctly.

I have been talking this afternoon again with the technical service complaining that the PC was the same and if before they told me that this was not normal, now they say that most motherboards of this type do this when the power supply button is turned off :wall:

I need advice guys because I honestly don't know what to think anymore.

The equipment is as follows:

CPU: Intel core i5 4690K
Motherboard: Asrock z97 pro4
RAM: 8GB G Skill Ripjaw DDR 3 1600
SSD: Crucial M550 256 GB
Power Supply: Templarius Imperator 650W 80 plus bronze

Regards

[whoololon]

Try it by disconnecting all peripherals except monitor, keyboard and mouse.
Write down (or take a picture) the serial number of the components that make up your computer, motherboard, power supply, etc., and so you will know if they have been changed or not.
Apart from all this, does the problem occur if you simply turn off the computer without more, that is, leaving the power supply switch on?

[NoKeR]

@whoololon:

Try it by disconnecting all peripherals except monitor, keyboard, and mouse.
Write down (or take a photo) the serial number of the components that make up your computer, motherboard, power supply, etc., and so you will know if they have been changed or not.
Apart from all this, does the problem occur if you simply turn off the computer without more, that is, leaving the power supply switch on?

Hello whoololon, the truth is that it was a oversight on my part not to write down the serial number, anyway I want to think that they changed it.

Before sending the computer to the technical service of these people, when I left the power supply switch on, it usually went well for me, that is, it started up on the first try without problems, but there were a couple of times that it did the pretend thing that I mentioned. so I no longer considered it normal.

For the moment and touch wood, leaving the power supply switch on has not done it to me, but of course I have only been with the pc for a day and a half, I have tried several times and so far everything is correct, but we are going with the other power supply that normally started well 90% of the time, so I have to keep testing.

If I remove the power supply switch and turn it on again the pretend thing always happens both with this power supply and with the other. As for the peripherals right now I only have those that you mention connected and the speakers.

Regards

[whoololon]

Well, if you have connected another source and the same thing happens, it could be the motherboard.
I have been reading the manual for your motherboard (in pdf), on page 72, confirm the status of "Restore on AC/Power loss" in the BIOS, because it could be that it interprets turning off the switch as a power outage, and pauses when turning on to check that the different voltages are stable.
If that is the case, and it looks like it is, we would be talking about a safety measure rather than a failure.
You will let us know.