Failure to boot following PSU replacement

[Imacflier]

Afternoon, All,

Well I replaced my Corsair AX 750 with a Corsair RM 750X trying to fix a no power problem.

I now have power, but no boot!

The hardware:

MB: GA-Z97X-UD5H Rev 1.0
CPU: I5-4570K (not overclocked)
Memory: 2 sticks, 8GB ADATA XPG (from Qualified Vendor/Memory List)
GPU: EVGA GTX1060 6GB
Storage: 250 GB Samsung SSD
5 x 3TB Seagate HDD
Background:

The system is a few years old and has been generally trouble free. In the past year or so, memory got a bit flaky and I have been using one stick of memory with no memory errors. This is with either of the two sticks installed and in any slot.

The Symptoms:

Fans run, MB lights illuminate, Continuous Short beeps, then boot loops.

Error code: 20

No video either GPU or on-board.

Done so far:

Verified cabling connections; reset bios; switched memory sticks...and tried both together.

Speculation:

since I once had flaky memory errors, perhaps I have a memory controller failure. I THINK that would be a cpu failure??

What do I do next? I do have an I5-4690K that I could swap in, but would REALLY avoid this if possible.

SO HELP!

TIA,
Larry

 

[SkyNetRising]

Did you OC your cpu?

GA-Z97X-UD5H uses AMI BIOS. There can be max 11 beeps. Count them.
https://www.computerhope.com/beep.htm

 

[Imacflier]

Did you OC your cpu?

GA-Z97X-UD5H uses AMI BIOS. There can be max 11 beeps. Count them.
https://www.computerhope.com/beep.htm

Nope, continuous rapid beeps....at LEAST 25 prior to boot looping.

CPU never overclocked.

 

[scout_03]

does the old psu still working i would try it back in system also made sure the modular cable are fully plug in .

 

[Imacflier]

does the old psu still working i would try it back in system also made sure the modular cable are fully plug in .

Old PSU has failed...cabling checked and rechecked...since the cabling had to all be replaced with the cables supplied with the RM750x

 

[scout_03]

could you test psu in another system and if it working good i would look at motherboard and cpu test on each .

 

[Imacflier]

could you test psu in another system and if it working good i would look at motherboard and cpu test on each .

How does one test the cpu or motherboard other than by replacement?

The New PSU passes on a PSU tester....though that does not test under load.

If no one has another suggestion I will swap in an I5-4690k what was planned for an itx system.

Larry

 

[scout_03]

try occt to test psu but i would check board the old psu might have brick it out or the cpu .