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PC won't boot unless I turn off the PSU and press the start button for 15-30 secs

Last response: in Motherboards
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July 27, 2014 5:59:38 AM

Hello, this is my first message on the forums :) 

Let me start by listing my components:

CPU: AMD Phenom II x4 955 ~ 3.6 Ghz
RAM: Kingston Hyper-X 8GB DDR2 800Mhz
GPU: Gainward Nvidia GTX 760
MOBO: Asrock Alivedual-eSATA2
PSU: Sirtec EP-750S, 750W, ATX 2.3, active PFC
HDD: Samsung Spinpoint F1 1TB

My problem started 4 days ago when I turned on my PC only to see all the fans and everything turn on but no booting took place, the PC didn't POST, it didn't even show the option to go to BIOS, just a simple black screen. I solved my problem after turning off the PSU and pressing the PC start button 2-3 times (the LED turned on the first time) until all the power was drained out of the capacitors, turning the PSU back on and starting the PC resulting in a successful boot. I tested my monitor and it works, tried to reseat my RAM, even checked every single component and cable and everything is ok, but every single time I try to start my PC I get a black screen unless I do the PSU work-around. Could the mobo be the cause of the problem? The PSU is brand new, got it a month ago, can't think of it being the problem since everything turns on inside the PC on start-up, including the GPU fans.

Waiting for replies and opinions :) 
a b ) Power supply
a b V Motherboard
a b à CPUs
July 27, 2014 6:22:10 AM

What you have there is a cheap or failing Psu.

If you have to turn the psu off by its rocker switch then unplug the power.
Turn the rocker on the Psu to normal operational power mode.

The you have two things wrong with it.

1. One of the power protection circuits of the Psu is malfunctioning.
It can be an, over voltage circuit, under voltage, short circuit protection, and so on.

Bad caps in the Psu that are badly fitted, and in most cases need to warm up to fully function.

2. Also be aware that some boards, mostly of the higher end quality do a test of all the voltage phases from a Psu.
If they don`t pass the test or are out by a high degree on the 12v+,5v+ or 3.3v+ then the board sends a signal to the Psu to cut all main power internal.

By the look of it your Psu is a single 12v rail. quoting a total of 56A.
Too much load on the line will cause a shut down of the Psu.

Or a fact you have forgot at add power needed to the motherboard where it requires it.
If you have the four pin from your psu connected to the board.
Then I suspect the board it`s self cannot handle the power draw of the 760 card.



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July 27, 2014 8:03:51 AM

Hey, thanks for the quick reply.

All of the pins are plugged into the motherboard, including the 4-pin connector, otherwise my PC wouldn't boot at all, I've been working with PCs for the past 8 years so I know a thing or two about connectors. It's interesting you say it might be a PSU problem, never really tought of that, but in no way you can call it a cheap PSU, since Sirtec is done by Corsair, one of the best PSU manufacturers out there.

I bought this PSU because my initial 600 watt one couldn't take the GTX 760, so I had to replace it. The system worked flawlessly with this PSU for the past two months, and even now I can boot it using that work-around and play heavy load games like Battlefield 4 or Rome 2 Total War for hours without any issue, my only problem would be why doesn't the motherboard remove all the static charge all by itself and I have to manually remove it by pressing the start button for 20-30 secs with the power cut off. I still got warranty on my PSU but I don't wanna do anything until I know for sure that that's the problem.

EDIT: I don't have to turn off the PSU by it's rocker to turn off the PC, it turns itself off when I shut it down, it's the power on part that gives me issues.
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July 27, 2014 9:07:45 AM

Sorry for the double post but the PC is really important for me, I gotta know if I should replace the mobo or send my PSU for warranty, I tested the PSU and it works, it powers on all the fans and LED lights, everything is on but it's like the mobo doesn't send a signal to the GPU so no image is displayed even tho the GPU is on and the fans are working, this is really weird...
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Best solution

a b ) Power supply
a b V Motherboard
a b à CPUs
July 27, 2014 9:14:00 AM

not to depress you in any way I to had tis a few builds back and after all was said and done it was the board [asus] all parts I tried on it worked just fine on other builds .. it was a pain to have to start it like that as you are but once it fired up to desktop it worked fine all day long
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July 27, 2014 9:28:46 AM

Hey man, thanks for the answer :)  Well it's not depressing, actually it would be more depressing to tell me the PSU is bad after spending 100 euros on it, especially since it's working like a charm. The board is 5 years old and it wasn't a good model/brand to start off, guess I'll have to replace it, thanks alot for the answer :) 
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a b ) Power supply
a b V Motherboard
a b à CPUs
July 27, 2014 9:38:06 AM

it starting doing like yours, but it did fire up and work until I boxed it up.. did not seem to affect nothing as far as that went [???]
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July 27, 2014 9:49:42 AM

Yea I know, really weird, well I wanted to upgrade my old Phenom II anyway so guess this is a good opportunity to get a newer board.
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a b ) Power supply
a b V Motherboard
a b à CPUs
July 27, 2014 9:54:01 AM

it's your call you can only do what you feel is right .. good luck
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July 27, 2014 3:04:44 PM

I think I might keep it for a while, does not seem to affect anything apart from the way it starts up, Ima save some money to get a better upgrade but it works fine as it is, I can even turn off the PSU at the end of the day and drain all the power via the power button so that the next day when I power it on it turns on without any problem, it's just weird that this started happening all of the sudden, wish somebody knew what exactly is wrong with the motherboard.

Thanks alot for all the help, great forum, I'll come back whenever I need answers :) 
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a b ) Power supply
a b V Motherboard
a b à CPUs
July 28, 2014 6:42:50 AM

about all you can do is start replacing stuff and hope it s something like that causing it or like you said just put up with it till your ready for a new build

all the parts except the cpu went on a new board and there was no issue with it so it was either the board or the chip on mine ..
good luck
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