no POST, no fans spinning, no LED lights

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kmoj86

Commendable
Feb 10, 2017
6
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1,510
Suddenly, my pc turned off and wouldn't turn on.
no POST, fans not spinning (case fans and cpu fan), motherboard LED not lighting up, no beeping codes (I attached an internal motherboard speaker).

I did the following diagnosis:

- stripped all the non-essential and tried to power on (breadboarding). removed the graphics card, HDDs and case fans. leaving only the power and the CPU fan plugged in.
- tried two different PSUs to power on the motherboard and still no power on.
- swapped the RAM sticks, and also tried only one RAM stick in each slot.
- tried the PSU and the CPU fan on other PCs and they work without any probems.
- I took out the CPU, checked it for damage, and cheked the socket's pins, but everything seems ok. there's no sign of any damage in either of them.

When I push the power switch to turn the pc on, no fans spin at all and there's no beep, and the motherboard's LED doesn't light up. although when I attach the graphics card, and push the power switch. the cards LED lights up, but still, the fans are not spinning.

eventually I even took out the CPU and RAM just to see if the pc will power on (lights turn on and fans spinning only), but still nothing happens. it's almost like there's no power at all coming from the PSU, but the PSU is working with no issues whatsoever with other pcs.

I also checked the power switch just to make sure it works, and it does.
also I tried jumping the power switch pins from the motherboard with a screw driver. and still the same issue.

I still don't know if the problem is from the motherboard or from the cpu.
please help me as I'm about to give up :(

Edit: motherboard's model is GA-Z170N-WIFI (rev. 1.0)
 
Solution
Karadjgne
There are hundreds of tiny capacitors, diodes, transistors, thermostats, ic chips, mosfets etc not to mention many feet of micro thin ribbon traces and thousands of solder joints on a motherboard. Yet with all that it only takes one small part that costs less than a nickle to fail and the motherboard is toast. Quality control is fallible, not perfect, and can't predict if a component will fail at any future time.

This, of course, does not take into consideration user abuse, such as when trying to get 26mm worth of wire in a 24mm space behind the mobo, maybe a fan wire finally gets punctured by an overheated, overlong solder tip and shorts out the mobo, 6 months after initial build.

If all of the testable parts are good, it comes...
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lfkfkfkffs

lfkfkfkffs

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Apr 2, 2014
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Did you try unplugging it and just holding down the power button for 20 seconds? might sound silly with all the other steps you have taken, but I've been saved by this even after removing everything from the case. This still fixed it
 
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Karadjgne

Karadjgne

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Dec 26, 2012
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There are hundreds of tiny capacitors, diodes, transistors, thermostats, ic chips, mosfets etc not to mention many feet of micro thin ribbon traces and thousands of solder joints on a motherboard. Yet with all that it only takes one small part that costs less than a nickle to fail and the motherboard is toast. Quality control is fallible, not perfect, and can't predict if a component will fail at any future time.

This, of course, does not take into consideration user abuse, such as when trying to get 26mm worth of wire in a 24mm space behind the mobo, maybe a fan wire finally gets punctured by an overheated, overlong solder tip and shorts out the mobo, 6 months after initial build.

If all of the testable parts are good, it comes down to the generally untestable parts, mainly the cpu and mobo. Cpus don't die easy, there's too much that'll fry a mobo long before any surge will get to a cpu. Given that, it seriously looks like the mobo is toast.
 
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Solution
K

kmoj86

Commendable
Feb 10, 2017
6
0
1,510
Just in case anyone's wondering. the cause of the problem WAS the motherboard.
after replacing it,my pc is working with no problems now.
thank you all for your answers.
 
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