PC Powers on, then off, then comes on normally

[muldy29]

Ok, for a week now, my PC will power on when I press the button, boot normally for a few seconds, then it just loses all power.
If I press the power button again, it boots perfectly fine.
I thought it could be the switch on the case, so have bought a new case and installed it, making sure all the connections are tight. For a while (2 turn ons) it was fine and I thought it was fixed, today I have gone to turn it on and it has done the same.
Is my PSU dying?
or could it be something else?

 

[Mellon Head]

I think that it might likely be your PSU. DO you have another that you could use to test the theory? Even one from a friend temporarily. It's better than buying a new supply and finding out that isn't the issue. But from what you're describing, it sounds like a PSU issue.

 

[muldy29]

could this also describe why my monitor flickers every so often when using split screen view or just watching Youtube in general, but in games at full screen, it runs fine?

 

[muldy29]

It's not the PSU, nor is it the power lead, as i am now using the new one that came with the PSU in a different plug socket, so its not that, Think I am going to have to live with it

 

[GEWB]

1. Go into the BIOS setup.
2. Under Power Management set the Power Loading to ENABLED.
3. Save & Exit the BIOS setup.

Let us know what happens.

Regards,
GEWB

 

[muldy29]

for the moment, it seems to have fixed it, will check again later and tomorrow, but hopefully

 

[Layback Bear]

Exactly what power supply are you using.
Post a site if possible.

 

[muldy29]

https://www.overclockers.co.uk/super-flower-golden-green-hx-750w-80-plus-gold-semi-modular-power-supply-black-ca-011-sf.html
This is the PSU I am using now
the previous one is a HIPER Type M HPU-4M630 630W Continuous @ 40°C (Maximum Continuous Peak: 870W) ATX12V V2.2 & EPS12V V2.91 SLI Certified CrossFire Ready Active PFC Power Supply - Newegg.com

 

[Layback Bear]

The reason I asked is because some newer power supplies have a pre-check if the power to the power supply has been removed.

Example:
If you turn the wall outlet power off to the power supply and then turn it back on, the power supply will do a pre-check.
This pre-check will start the power supply and then stop and restart if everything is okay.
If you leave the power (wall socket) to the power supply on it will not do this stop and start thing.

My AX860i will act this way. Your millage may vary.

 

[muldy29]

It is left on permanently at the wall.
Turning my pc on this morning it did the same thing as before, on, off then powered on.
Just now after work, it came straight on, so will keep an eye for a day or 2

 

[muldy29]

Not fixed, still doing it

 

[muldy29]

Just an update, i have a PCI-E add in card with 4 USB 3 ports on it, that has also stopped working now, I have reseated it several times and it is continuously dead, so is it possible the Motherboard is failing?
I have just checked and it is just over 2 years old now

 

[Layback Bear]

Remove you PCI-E card and see if your on-off problem is still happening.

 

[muldy29]

having removed the PCI-E card, i noticed a Sata Power socket on the end and have now connected this up and it seems to have solved the problem, will check tomorrow morning as well, before marking as solved as that was only unplugged in the case move and was connected before when i had the problem.
Also my OCZ Agility SSD 60GB has now vanished from windows so maybe that failing was something to do with it

 

[muldy29]

Nope, still doing it
Also did the unthinkable 2 nights ago and updated the BIOS, went fine but still the same problem

Updated my system specs

 

[Layback Bear]

Sorry, I know nothing about W-10.

Your specs.

Computer type PC/Desktop
System Manufacturer/Model Number Custom
OS Windows 10 Home x64
CPU Intel Core i5 Quad CPU 4440

 

[muldy29]

ok, thanks, although i'm quite sure it's nothing to do with Windows as it happens just after POST and before any of the HDDs are accessed

 

[GEWB]

ok, thanks, although i'm quite sure it's nothing to do with Windows as it happens just after POST and before any of the HDDs are accessed

Correct, not OS caused.

Does it present any problem other than a longer boot time?

Regards,
GEWB

 

[muldy29]

Nope, It just means i have to stay with the PC after pressing the power button the 1st time, after the 2nd time it just carries on as normal

 

[gldndragn]

I have personally seen this behavior on several Gigabyte branded boards.....both AMD as well as Intel based. You might try to contact Gigabyte about the issue.

It may be something else....hard to tell exactly. This just has been my experience.