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Maximus VIII Impact - No POST, No Q-code, No Qled

LionwoIF777
Level 7
Relevant build details:
MB: Maximus VIII Impact
PSU: Silverstone SFX Series SX600-G 600W

Issue: New build - I was not getting any Qcode or display or passing POST, and my BIOS flashback button slowly pulses blue.

So;
- I removed power
- Removed my ram, GPU, CPU, SSD, 8 pin 12V power connector, etc
- I left ONLY the 24pin power supply connected to my motherboard and powered up, on a non conductive clean surface.

There was no change.

- I decided to clear CMOS.
No change.

- Cycled power
No change

- I download and flash the latest BIOS.
BIOS flashback button pulsed blue rapidly for a time, then returned to a slow pulse.

- I re-download the BIOS file and flashed from a different USB.
Same result.

- I tried the 'paper clip' test on the PSU both with and without the 24 pin cable.
PSU fan never spun up (however i didnt have anything to apply load to the PSU with, and have read that some need a load for this test to work)

- I went and got a multimeter to measure the voltage of each of the 24 pins.
On the 24 pin connector, one pin had 5V, one had 3.5V, the others all had 0.
The pin that should have been supply-ON, and brought low to start the PSU supplying power was already low.
No other voltages were present on any of the PSUs pins.

- As a last ditch test i tired shorting the 5V pin that was working to GND.
Nothing

- Also tried the 3V
Nothing

- Using the multimeter i checked the supply cable to the PSU
its fine.


My only ideas are as follows:
a) The Mobo bios is corrupt, flashback is not working, and my PSU needs a load for the paperclip test (Unlikely?)
b) The PSU is no good
c) The MB 24 pin header or its control of it is no good.


Thought/ideas please!!
15,617 Views
19 REPLIES 19

Chino
Level 15

Thank you,

I had a look but everything looks fine to me with the cpu sockets pins.


Any idea what the slowly pulsing blue light on the flashback button indicates?
It is about half the speed that it pulses when flashing a new bios.

Nate152
Moderator
Hello LionwolF777

No code from the motherboard usually means a faulty psu or motherboard and you've got it narrowed down to both, would you have a spare psu to test with ?

Thanks for the response,

Got a new PSU online yesterday, tracking says it will arrive today.

I will test with it and post my findings.
Really, really really hoping its not the MB.

LionwoIF777 wrote:
Thanks for the response,

Got a new PSU online yesterday, tracking says it will arrive today.

I will test with it and post my findings.
Really, really really hoping its not the MB.


When the new PSU gets there, test your motherboard with it still on the cardboard box. Make sure you populate the 8 pin power header. For testing use a single memory module. Also verify that you're not overtightening the screws for your heatsink.

Nate152
Moderator
All right sounds good LionwolF777, let's hope it's the psu.

Give us an update when you get it installed.

What psu did you get and what gpu do you have?

The way to test your psu with a paper clip is to just connect it to a case fan If you have a molex adaptor with your fans or psu cables.
Some psu fans don't Spin on idle only on full power... wich is the case with my psu and that's how I tested it when I thought it was faulty. Important thing before powering on a psu is to press the start button of your pc for 5 seconds to drain any last juice of electricity or static energy from plugging and unplugging cables. I do it after removing cables and before connecting cables. Once I saw one of my vga cable short circuiting by touching my cup case while it was unplugged from my pc. Luckily nothing serious happened

Nate152 wrote:
All right sounds good LionwolF777, let's hope it's the psu.

Give us an update when you get it installed.

What psu did you get and what gpu do you have?


my GPU is the ASUS Strix 980Ti OC, but i dont have it connected to the MB.
the PSU is the silverstone SFX sx600-G, 600w

- new PSU arrived, tested it
no change. its like it wont even begin POST, as i get no q-codes.

- checked for bent or missing cpu pins.
none.



just wish i knew the meaning of a slowly pulsing blue bios button.