My computer turns on but displays nothing!

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Kostas Dr.

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Nov 14, 2019
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After searching, I thought to change the RAM in different ( PCI) slots and my PC started normally and display as well. So, i restarted my pc after 10 minutes and all things did well. But when i shut down and i press the power button to turn on my pc did not start. So, i made the same thing and nothing changed.

In other words, when i change the RAM in different PCI slots my pc works and my monitor is working. Without changing it in another slot, when i restart it everything goes fine, but when i shut down and press the power button to turn on, my monitor does not work and the front fan too.... why??
there is no beep or motherboard LED's ! I built my PC in 2014

CPU: Intel Pentium G3258 3.2 Ghz
PSU: Corsair VS Series 450 WATT
MOTHERBOARD : Gigabyte GA-Z97M-D3H
RAM: Corsair CMZ8GX3M2A1600C9 Vengeance 8GB ( 2x4GB) 1600 MHz
SSHD: Seagate ST1000DX001 1TB 3.5 DESKTOP
SSD: Samsung MZ-7TE120BW 840 EVO
I do not have Graphic Card.

PC is running Windows 10 Pro Version 1903

When I change the ram I mean that i shut down PC and i unplug supply cable, all usb cables, LAN cable, and VGA cable. There is nothing connected to PC. Later, I press down the tabs at either end of the slots and i change the ram. For example by grey slot i install it to the one black slot. So when my computer turns on but Displays nothing i remove it from black slot to other grey slot. My Motherboard has 4 slots. ( black, grey, black, grey). In the end, I plug all cables and my PC and my monitor work fine.
 

vger

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Hello

So if you change the ram into different slots and you have issue's ,but if you do not change the ram in different slots the pc works correctly?
 

Kostas Dr.

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Nov 14, 2019
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Thank you so much for your reply!
When I first press the power button to turn on the computer, it displays nothing. I observed that my front case fan does not work, while the rear works fine. So, I shut down the computer by pressing the power button for 5 sec. you know, and then I unplug all the cables and I re change either one Ram memory or two in different memory slot. After that, I plug all the cables and I press the power button to turn on my pc, and then my computer and the front case fan work correctly and of course it displays.
However, when I want to turn on my computer again, after having shut down my PC, the issue still remains...
I also tried to reset CMOS by replacing CMOS Battery and finally the issue did not solved.
So, if I don't change the ram in different slots, my pc does not work correctly. I don't have another choice.
Please help me find where is the problem!
 

Bruce

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Support Team
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Oct 8, 2017
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I'm wondering if the RAM is a red herring.
that is, the time it takes you to change the RAM gives the PC enough time to discharge components perhaps.
also can't rule out a PSU or mobo fault. they are 5 years old!
it restarts fine by the sounds of it, it's the cold starts it fails on.

so a test would be - turn it on and get it working - all good.
do a restart - all good.
turn it off and try turning it on via the power button - no luck.
pull out the power cord from the wall, press the power button to discharge the capacitors.
put the wall cable back in and try to turn it on now - what happens?
 

Kostas Dr.

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Nov 14, 2019
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I'm wondering if the RAM is a red herring.
that is, the time it takes you to change the RAM gives the PC enough time to discharge components perhaps.
also can't rule out a PSU or mobo fault. they are 5 years old!
it restarts fine by the sounds of it, it's the cold starts it fails on.

so a test would be - turn it on and get it working - all good.
do a restart - all good.
turn it off and try turning it on via the power button - no luck.
pull out the power cord from the wall, press the power button to discharge the capacitors.
put the wall cable back in and try to turn it on now - what happens?

Thank you for your reply!
I thought to do this. I unplugged all cables ( Mouse, Keyboard, LAN, VGA ) and of course power cord, and then I pressed the power button in order to discharge the capacitors for 2 minutes, but still the issue did not solved...
So, how can I detect which one of these ( RAM, PSU and Motherboard) is really defective? or CPU although I don't think so.
 

phillpower2

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Sep 9, 2016
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Could be a problem with the power good signal between the MB and the PSU.

The first test that I would be doing if you can is to borrow a known good PSU to swap in for testing purposes, you should also check the capacitors on the MB for any signs of bulging or leaks, see info here
 

Kostas Dr.

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Nov 14, 2019
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Thank you so much for your reply!
I don't know if I
i made a mistake!
I don't know if I can find a good PSU, but i will try something. From your own experience, is there any chance my RAM to be defective or my CPU?
 

phillpower2

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Sep 9, 2016
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Impossible to say for sure but certain other factors make either being the cause less likely.

PSU: Corsair VS Series
VS = Value Series which means that this is a budget PSU and the only way to rule it out as the cause is to try another PSU.

When I first press the power button to turn on the computer, it displays nothing. I observed that my front case fan does not work, while the rear works fine.
A bad CPU or RAM would not cause this behaviour.

Where does the power come from for both the front and the rear fan, are they both connected to the MB or does one of them connect to the PSU.
 

Kostas Dr.

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Nov 14, 2019
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Impossible to say for sure but certain other factors make either being the cause less likely.

VS = Value Series which means that this is a budget PSU and the only way to rule it out as the cause is to try another PSU.


A bad CPU or RAM would not cause this behaviour.

Where does the power come from for both the front and the rear fan, are they both connected to the MB or does one of them connect to the PSU.
thank you very much! I will try to find an another PSU and I will reply again!
 

phillpower2

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Sep 9, 2016
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Can I ask that you do not quote every reply, it really does not help any and just makes for unnecessary reading, thanks.

Where does the power come from for both the front and the rear fan, are they both connected to the MB or does one of them connect to the PSU.
Can you answer this for us.

I would not purchase anything until another PSU had been tried in your rig.
 

Kostas Dr.

PCHF Member
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Nov 14, 2019
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I am in the process of finding a PSU for testing purpose. So, I don't have any update...
 

phillpower2

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Sep 9, 2016
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If we don`t hear back from you in a couple of days we will close your thread and wait for you to send us a PM to reopen it.
 
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