PC wont post, no beeps, no display, turns itself on when plugged in

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xmark123

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Jan 13, 2012
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I was playing a game the other day(BF4) and the PC froze. It got stuck one screen and ctr-alt-del, alt f4, nothing would work. I had to force shut down the system, after which I tried turning it on to find that I couldnt get a post, a beep or a display, the fans work, motherboard light is on(the standby light, it doesn't have any others.)
Also whenever I plug in the PC to the outlet it turns itself on and the situation is as above. Breadboarding gave me the same result. I tried with only the CPU and the motherboard connected to the PSU but couldn't get beep.
No display from either integrated or the GPU in any case.

The intel startup sound usually plays when the system posts but I couldn't get it.

Here are my pc specs
Intel core i7 2600k
Intel DH77EB (mobo)
Gskill Ripjaws X 4x2GB
Antec earthwatts 750w psu
asus gtx 750ti
intel 240 gb ssd

I tried another known working PSU in my PC and my own in another pc.
The former cant get me to post, the latter works in the other pc.
Could the motherboard have gone out? Would there be any beep if the cpu was malfunctioning?
Power outages are very frequent in my area. The motherboard is still under warranty. CPU and GPU temps were well within limits.

 
Solution
helpstar
Is The battery correctly installed? Plus visible. Replace battery
Did you clear the CMOS by jumper or just battery? Did you do it while the computer was disconnected from the wall plug?

The graphics card was removed while testing with ram motherboard and CPU?

Is a PCI express mini card installed? Remove that too

Check the CPU socket of the motherboard, eventually bent pins?

Which CPU cooler is installed?

Did you test the motherboard outside the case on a non conducting surface like uncoated card board?
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Shaun o

Shaun o

Illustrious
Oct 7, 2007
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Hi Mark.

I suspect the cause is your Psu.
One of the power protection circuits of it may of triggered.

So as a test and to reset the protection circuits of the Psu follow the instructions bellow.

Turn the system off.

Then go to the back of the system tower.
Look for a rocker switch on the power supply unit it`s self, and switch it over to the other switch state.
The switch will have a O and - symbols on it.

Next turn off the switch at the all socket.
And pull the plug from the wall socket for the power cable to the psu.
Count about ten seconds.

Then plug it back in, and turn the switch on at the wall socket.
Next turn the rocker switch back to it`s original position on the PSU.

Power the system up by the power button on your case and see if it fully powers up then.

If a power supply becomes too overloaded, or to hot then it will trigger a protection circuit of a psu. and it will not fully power up until the protect tion circuit is reset in this manner mark.

 
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csm101

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Aug 8, 2007
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can you test ur PSU? i mean you need to have at least that cheap LCD screen tool where it shows all the voltages etc on the screen. if you have warranty in place i suggest that you return the whole thing to the place of purchase and get there opinion. this is most probably either PSU or mobo issue.


 
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xmark123

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I did test the PSU like I said in the opening post, its not a PSU problem. The other working PSU I tried got me the same result : mobo turned itself on, fans on, lights on but no post or display
 
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xmark123

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Everything is connected. Also if it makes any difference there's a huge grounding problem at my apartment because of which current used to flow into the metal parts of the case and I'd get shocked. Could that have anything to do with whats happening here?
 
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xmark123

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Current would only flow into the case when I connected the tower through a surge protector. And you wont believe this but the damned doorbell disconnects the internet for a few seconds. The place is fked up
 
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helpstar

helpstar

Titan
Dec 25, 2012
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Is The battery correctly installed? Plus visible. Replace battery
Did you clear the CMOS by jumper or just battery? Did you do it while the computer was disconnected from the wall plug?

The graphics card was removed while testing with ram motherboard and CPU?

Is a PCI express mini card installed? Remove that too

Check the CPU socket of the motherboard, eventually bent pins?

Which CPU cooler is installed?

Did you test the motherboard outside the case on a non conducting surface like uncoated card board?
 
Upvote 0 Downvote
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