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ASRock x570 Phantom 4 will not post

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Fencerrick View Drop Down

Joined: 16 Nov 2022
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    Posted: 16 Nov 2022 at 2:53am
I built my computer 2 1/2 years ago
ASRock x570 Phantom 4 Gaming Motherboard
AMD Ryzen 5 3600 CPU
Noctua NH-U12S Cooler
Gigabyte GEFORCE RTX 2070 Super GPU
TForce 16 GB DDR4 x2 (i.e. total 32 GB)

It ran well for the last 2 1/2 years

It would not start the other day. It did not even post and did not restart. I could not enter the UEFI. There was one LED post light lit. It was the boot light. I checked some forums and this had happened to others. The ultimate solution was to replace the CPU.

I purchased a new Ryzen 5 5600 CPU. I downloaded and have the bios update.

I have installed the new chip and tried restarting preparing to update UEFI. The CPU and DRam LEDS come on and stay on. After about 15 seconds it powers off and restarts. I am spamming the F2 or Del key as I power on.

I have:
removed and reseated the CPU
removed and reseated the GPU
removed and reseated the DRam
removed the CMOS battery and held the start button for 15 seconds while unplugged and reseated the CMOS battery

I do not know what to try next.

Any suggestions?

Thanks in advance
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cx5 View Drop Down
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Joined: 15 Sep 2017
Location: Hong Kong
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Post Options Post Options   Thanks (0) Thanks(0)   Quote cx5 Quote  Post ReplyReply Direct Link To This Post Posted: 16 Nov 2022 at 4:31pm

Your old bios does not recognize the new CPU, hence can't boot into UEFI.

You must use a Zen2 generation CPU or older to boot into the old bios, then update to bios version 7.00(BRIDGE), next remove the old cpu and insert the new cpu, finally update bios again to latest, probably 7.1 or whatever.
2x8GB HOF4CXLBS3600K17LD162C
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3800x PoseidonAbsoluteZero4 BarrowPWM-17w>bykski420x140x28
XFX SWFT 319 6900XT
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