PC won’t power on but mobo has power

Megahurtz400 · 4 Jun 2019 at 18:15

Hey all,

Strange problem, came home today and my pc won’t power on, no fan movement nothing.

First thought was a lightning strike as it’s been rainy today but everything else is fine and the PSU isnt blown as the mobo is receiving power as the power switch on the LED is lit by a red LED and the Ethernet port on the back in flashing.

Tried resetting the cmos via the switch on the motherboard and removing the battery for a few mins but hasn’t worked.

Tried one stick of ram and hasn’t worked.

Tried with all usb devices (including internal headers for RGB control etc) disconnected and nada.

I don’t have easy access to a PSU or other parts which I could test with so does anyone have any advice on what to try next?

Update:

The RGBs on the RAM seem to be lighting up now but still not sign of anything else?
Specs:

Ryzen 2700X
Gigabyte gaming 5 X370
Teamgroup Night Hawk RGB 16gb
Vega 64 Sapphire Nitro Plus
BeQuiet! Straight power 850w

Servo · 4 Jun 2019 at 18:41

On/off switch faulty? Opps just seen your update

Megahurtz400 · 4 Jun 2019 at 18:47

Servo said:
On/off switch faulty? Opps just seen your update

When I press the power switch on the case the power switch on the motherboard flashes, and it does the same when I press the motherboard power switch.

Servo · 4 Jun 2019 at 18:49

I think you need to try another psu

Megahurtz400 · 4 Jun 2019 at 18:55

Servo said:
I think you need to try another psu

Would a faulty PSU not mean that there wouldn’t be any power to the motherboard at all?

Therefore no power switch LED on the motherboard and no RGB lights on the RAM?

Servo · 4 Jun 2019 at 18:59

The psu supplies a number of voltages 5v 12v -5 and grounds, so the higher volts might not be working but enough to light the leds.

I'm sure someone will be along who could help more.

EsaT · 4 Jun 2019 at 19:08

Megahurtz400 said:
Would a faulty PSU not mean that there wouldn’t be any power to the motherboard at all?

Unless completely dead, PSU connected to power always provides 5V standby to PC.

And even that LED on motherboard doesn't really tell anything sure...
Except that 5Vsb is high enough to get that LED glowing, but not high enough to burn it.

Servo · 4 Jun 2019 at 19:10

EsaT said:
Unless completely dead, PSU connected to power always provides 5V standby to PC.

And even that LED on motherboard doesn't really tell anything sure...
Except that 5Vsb is high enough to get that LED glowing, but not high enough to burn it.

That's what I tried to say

Megahurtz400 · 4 Jun 2019 at 19:23

Popped round a friends and nicked his PC and with the 24 pin and 8 pin from his PSU plugged into mine the PC now boots but doesn’t seem to produce a video signal (using HDMI on motherboard) and gives me an error code of 0d.

Don’t know anyone else with a Ryzen system so not sure how to go about testing cpu/mobo/ram

Megahurtz400 · 4 Jun 2019 at 19:25

Servo said:
That's what I tried to say

Ah I’m with you now, sorry bud!

EsaT · 4 Jun 2019 at 19:34

Megahurtz400 said:
Popped round a friends and nicked his PC and with the 24 pin and 8 pin from his PSU plugged into mine the PC now boots but doesn’t seem to produce a video signal (using HDMI on motherboard) and gives me an error code of 0d.

Ryzen doesn't have integrated GPU.
So you need to power graphics card and have monitor connected to it.

Motherboard's manual again doesn't list that particular debug code, so can't say what it means.

Megahurtz400 · 4 Jun 2019 at 19:35

EsaT said:
Ryzen doesn't have integrated GPU.
So you need to power graphics card and have monitor connected to it.

Motherboard's manual again doesn't list that particular debug code, so can't say what it means.

Ah that’s probably why I’m not getting any video signal then

Will need to wait till the weekend before I can get my mates PSU fully out of his machine then I’d expect

Servo · 4 Jun 2019 at 19:52

Happy you got it sorted

Megahurtz400 · 4 Jun 2019 at 20:09

Servo said:
Happy you got it sorted

Wish it was sorted, would this point to it being a PSU fault in your eyes?

Is it worth RMAing my PSU straight off the bat?

Servo · 4 Jun 2019 at 20:17

It does sound like the psu. It boots with your mates psu, so I would Rma it

Megahurtz400 · 4 Jun 2019 at 20:33

Servo said:
It does sound like the psu. It boots with your mates psu, so I would Rma it

Webnote sent, cheers for you help mate

Anyone know how long the BeQuiet! RMA process takes? Made a thread in the the wanted forum looking for a temp PSU just in case it’s going to be weeks.

Think this is my PCs way for thinking about selling her this afternoon

Danny75 · 4 Jun 2019 at 20:41

PSU is a good bet. But I would test your GPU in your friend's PC before sending off the PSU. Some systems will not power on with a dead GPU. And your testing with his PSU to only the 24 pin and 8 pin wouldn't rule it out.

Megahurtz400 · 4 Jun 2019 at 22:43

Danny75 said:
PSU is a good bet. But I would test your GPU in your friend's PC before sending off the PSU. Some systems will not power on with a dead GPU. And your testing with his PSU to only the 24 pin and 8 pin wouldn't rule it out.

Will give this a test.

On the topic of temp PSUs, would a EVGA BQ 650W 80 Plus do the job for a few weeks if it takes that long?

Danny75 · 4 Jun 2019 at 23:22

Megahurtz400 said:
Will give this a test.

On the topic of temp PSUs, would a EVGA BQ 650W 80 Plus do the job for a few weeks if it takes that long?

Yes should do. 54A on +12v.

You were using two separate power cables from the PSU for that card, yes?

Megahurtz400 · 5 Jun 2019 at 08:07

Danny75 said:
Yes should do. 54A on +12v.

You were using two separate power cables from the PSU for that card, yes?

My original PSU? Yes, two separate power cables.