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No signal on display, can't go even to bios

Z

zeroed

Joined
Apr 4, 2016
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When i press computers power button leds on front light up but display does not turn on and neither does keyboard get any power (illuminated). When i push power button for a few seconds i can turn computer off. After that i can turn the computer on normally and everything works. Can someone tell me why i have to turn on computer twice? Turn on -> turn off -> turn on from power button.

I have tried:
- Taken and reinstalled components and wires (not processor)
- Taken powercord off and pressed power button about an minute
- Cleared CMOS

What i've read from net some people say that power supply, processor or motherboard might be broken. But when i manage to get computer to desktop everything works fine. No BSODs, no hang ups.

Motherboard: Asus Maximus VIII Ranger
Processor: Skylake QuadCore Intel Core i7-6700K, 4GHz
Memory: Kingston HyperX KHX2133MHz ddr4 2x8GT
Video card: MSI Geforce GTX 970
Display: Asus MG279
Power: Seasonic 550W S12G-550, 80 Plus Gold

Computer works normally when it is restarted, also access to BIOS is then possible.
 
Last edited:
educated guess that your BIOS settings might be wrong, and after a failed post its resetting to 'safe' settings for the next boot.

RAM settings in particular could be the problem.
 
After you get it fully booted and all seems to be working, do you normally shut it down, or do you just let it go to sleep? If you let it go to sleep, this could be a sleep issue and not a boot issue.

Since you reset the BIOS, this should not be an OC or RAM setting issues.

If me, I would replace that CMOS battery. While they should last for many years, they don't always. I've even had a couple that were bad right out of the packaging. Just be sure to unplug from the wall and touch bare metal of the case interior before reaching in. Then be sure to boot directly into the BIOS Setup Menu the first time after replacing the battery, check/set your data and time and boot order. You might also check your power button settings as you can configure how it functions in the BIOS menu too.
zeroed said:
- Taken powercord off and pressed power button about an minute
Click to expand...
That's an old wife's tale remedy. It would only have any effect (if any) if the PSU was a budget model from about 20 years ago, or if the PSU was damaged. And that is not likely if the computer works fine once finally booted.

Because you see no indication on the keyboard either, I would want to eliminate the power supply from the equation as soon as possible. So if me, I would swap in a spare or borrowed PSU right away and see if you get the same symptom.
 
Bill_Bright said:
That's an old wife's tale remedy. It would only have any effect (if any)
Click to expand...

It helps solving motherboards boot looping motherboard OC failure detection mechanism often, and that's the culprit.

Cold boot reinitializes full MEI firmware load from firmware hub, also resets clock generators and their initialization routine is done fully.

For me it happens when boot VCSSA is too low on heavy OC. It doesn't endure a cold boot on 2400MHz RAM speed. Pulling up the ram speed by steps from 1600MHz up works or just I have to set up the boot up voltage higher, afterwards it settles to the casual settings.

You should have an updated motherboard bios soon... doing actually the same... upping boot voltages...
 
double posting on Intel boards is normal what *should* happen is you press the power button the machine should turn on,then off,then on and continue booting


*this should only happen after AC-powerloss unless there is something wrong with your psus's standby rail or its not 'haswell certified'
I would try anouther power-supply
 
OneMoar said:
this is one of the rare cases where you may need a bios update
Click to expand...

Yea, actually it has a recent bios update dated

2016/03/25
 
Ferrum Master said:
It helps solving motherboards boot looping motherboard OC failure detection mechanism often
Click to expand...
Simply unplugging the PSU from the wall (or flipping the master power switch) to remove the "+5Vsb" standby voltage that is being applied across several points of the motherboard is what solves that issue - not holding in the button. Holding in the button does noting but tire your finger as it just shorts a "momentary" circuit on the motherboard as controlled by the BIOS.

In the olden days with AT (before ATX) power supplies, the front panel power button was tied in through a wiring harness that ran directly back to the power supply. In those supplies, holding in the button "could" allow any residual voltages in the storage caps to bleed off that were not automatically bleed off, as they should have been though a bleeder resistor.

With today's ATX supplies, the power button is just a "remote" "momentary" switch on the "low voltage" +5VDC standby circuit that runs through the motherboard. Neither this circuit or the switch carries any AC, high "line" voltages that need to be, or even could be bled off by holding the button in.

So again, holding in the power button after you remove the power cord on an ATX and properly working power supply does absolutely nothing - but tire your finger.
 
OneMoar said:
either a bad psu,buggy bios or bad board
Click to expand...
I agree. So swap in a spare or borrowed PSU. That does not cost anything but will eliminate the PSU from the equation. The BIOS has already been reset so that should not be the problem, unless the board is bad. :(
 
Bill_Bright said:
So again, holding in the power button after you remove the power cord on an ATX and properly working power supply does absolutely nothing - but tire your finger.
Click to expand...

Bill how many times I have to say the difference from cold and hot boot, please read up Intel PCH design guidelines and how really the bridge and initialization works now. It ain't a i430FX chipset you have to scrap the classic CMOS idioms.
 
Ferrum Master said:
Bill how many times I have to say the difference from cold and hot boot
Click to expand...
lol

It would really help with the discourse of this and other threads if you actually followed the conversation. :(

Contrary to what you may believe, we are not mind readers. Until just now, you never said anything about cold or hot boots. So to answer your question, just once. But regardless, that is irrelevant as you are incorrect anyway. My response about an old wife's tale was correct and still stands.

I guess this goes back to your literacy problems noted in that other thread because if you had actually read the OP's post, you would notice (I'll bold underline it this time just for you) the OP said he had "Taken powercord off and pressed power button about an minute".

So please read up on how ATX power supplies work, and in particular, how the +5Vsb in the PSU and across ATX motherboards works before you criticize others about something you clearly don't understand.

And just in case you still don't understand, when you take the power cord off a power supply, that implies a "cold" boot.

Now to avoid getting tied up in another OT discussion and driving this topic away from the OPs problem, I will avoid responding to you again - except to prevent the OP from being misinformed.
 
Hey bill instead of arguing in everyone's help thread you let people help?

@erocker @btarunr this is getting old quick.
 
Bill_Bright said:
Taken powercord off and pressed power button about an minute".
Click to expand...

You are judging the about about what he did and making fun of it comparing to old wife's tale remedy that is actually not true?

I've clarified why the board gets stuck actually during the boot phase. And powering down the 5Vsb and all charge in the caps on that line executes the PCH controller to read the SPI flash region to initialize and decrypt MEI region and then the
modules. 5Vsb if there are no LED attached isn't used much and discharges slowly and in order to trigger the cold boot you need to wait actually.

Here is a link. Look up to the last pages where the links to sources are. There you will find the info. Over and out.
 
Right! It is just me doing the arguing? Another telling someone "how many times do I have to say" is not arguing? Telling someone to read up on something that has nothing to do with the issue is on point and helping the OP?

I get you don't like me. And I'm okay with that. But does joining a thread for the sole purpose to criticize another help the OP? That gets old quick too.

The OP was under the impression unplugging a PSU and holding the power button for a minute does something. It doesn't. Does explaining that hurt the OP - or is that grounds for being told, "how many times.... yadda yadda"?
 
I call it Obama/NSA bios guidelines :D

Also would rather see hell freezing faster than Seasonic 550W S12G-550 failing already.
 
@FM - making fun? How?
Ferrum Master said:
And powering down the 5Vsb and all charge in the caps on that line executes the PCH controller to read the SPI flash region to initialize and decrypt MEI region and then the
modules. 5Vsb if there are no LED attached isn't used much and discharges slowly and in order to trigger the cold boot you need to wait actually.
Click to expand...
Yes! You are right! I did not say otherwise.

But it only takes a few seconds, not a minute (assuming the supply is not damaged). The point I was making was about pressing and holding the power button. That does nothing.
 
@OP make sure your memory is set to correct voltage in Bios next boot up.
Pulling the cord holding power drains the caps removes reaidual power in system...
 
OneMoar said:
agree the more I read on ASUS's Z17xx boards the more I see that the bios is stable as a game of jenga being played by palsy people
at one point I had that pdf and the related ones but they died when my array crashed
Click to expand...

Because they switched from AMI Aptio IV to 5 platform mostly with some X99 and Z17xx, it is very immature still... all the drivers and structure. I also only have seen unexplainable things the thing does sometimes... I am really not keen to Skylake build for myself yet.
 
Maybe the power or reset button it is defective, try to start without them...
 
Chill people and be helpful or move on.
 
I cannot because this is not a section where I have moderator powers. A mod may be along soon to cleanup.
 
It's a little tiring seeing the same few faces arguing in multiple threads every day.

can the crap. Just because a single post doesn't breach the rules, doesn't mean the recurring arguing and negative attitudes towards each others opinions will be tolerated.
 
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