B550 Phantom Gaming 4ac

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   Hi there
I am trying to get a new build working but cannot get the system to POST.

Symptom:  The CPU and DRAM lights on the board flash, CPU fan spins but case fan pulses and does not spin.

Mobo: B550 Phantom Gaming 4ac
CPU: AMD Ryzen 5 5600X
Memory: DDR4     ADATA     3600     3600     8GB     AX4U360038G18A-DT60
Storage: Firecuda 520 500GB M.2

Can someone please advise best course of action?

Cheers

Brendon

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bde_au Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 31 Jan 2022 Status: Offline Points: 80	Post Options Post Reply Quote bde_au Report Post Thanks(0) Quote Reply Topic: B550 Phantom Gaming 4ac Posted: 31 Jan 2022 at 2:29pm
	Hi there I am trying to get a new build working but cannot get the system to POST. Symptom: The CPU and DRAM lights on the board flash, CPU fan spins but case fan pulses and does not spin. Mobo: B550 Phantom Gaming 4ac CPU: AMD Ryzen 5 5600X Memory: DDR4 ADATA 3600 3600 8GB AX4U360038G18A-DT60 Storage: Firecuda 520 500GB M.2 Can someone please advise best course of action? Cheers Brendon

kerberos_20 Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 06 Dec 2017 Location: czech republic Status: Offline Points: 3687	Post Options Post Reply Quote kerberos_20 Report Post Thanks(0) Quote Reply Posted: 31 Jan 2022 at 7:25pm
	where is your GPU?
	userbenchmark

Xaltar Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: 16 May 2015 Location: Europe Status: Offline Points: 25298	Post Options Post Reply Quote Xaltar Report Post Thanks(0) Quote Reply Posted: 01 Feb 2022 at 12:46am
	Kerberos_20 has a point, you need a GPU with the Ryzen 5 5600x. The display outputs on the motherboard only work with APUs (Ryzen XXXXg).


bde_au Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 31 Jan 2022 Status: Offline Points: 80	Post Options Post Reply Quote bde_au Report Post Thanks(0) Quote Reply Posted: 02 Feb 2022 at 4:00pm
	The GPU is an ancient thing that I am struggling to find the model for. The behaviour is the same with the GPU inserted or not.

Xaltar Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: 16 May 2015 Location: Europe Status: Offline Points: 25298	Post Options Post Reply Quote Xaltar Report Post Thanks(0) Quote Reply Posted: 02 Feb 2022 at 11:21pm
	Some older GPUs (PCIe v1.1 and older) may not work on newer boards. It can be hit and miss, some do, some don't. Particularly older Quadro and Firepro cards seem to not work. Also check what BIOS version is on your board, the version it shipped with will be printed on a small white sticker on the BIOS chip itself. Once you have the version you can check it against the CPU support list here: https://www.asrock.com/mb/AMD/B550%20Phantom%20Gaming%204ac/index.asp#CPU As you can see, if your board shipped with an earlier version than 1.20 then your CPU will require a BIOS update to work. For this you will either need a compatible 3000 series CPU or to take your board in to a service center/store and ask them to do it for you.


bde_au Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 31 Jan 2022 Status: Offline Points: 80	Post Options Post Reply Quote bde_au Report Post Thanks(0) Quote Reply Posted: 03 Feb 2022 at 2:37pm
	The GPU is PCIe 2.0. The BIOS is 1.80 so it should be compatible. I appreciate the suggestions.

bde_au Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 31 Jan 2022 Status: Offline Points: 80	Post Options Post Reply Quote bde_au Report Post Thanks(0) Quote Reply Posted: 04 Feb 2022 at 7:04am
	The updated component list: Mobo: B550 Phantom Gaming 4ac CPU: AMD Ryzen 5 5600X Memory: DDR4 ADATA 3600 3600 8GB AX4U360038G18A-DT60 Storage: Firecuda 520 500GB M.2 PSU: MSI MPG A750GF GPU: GIGABYTE GeForce GTX 1050 Ti Low Profile

Xaltar Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: 16 May 2015 Location: Europe Status: Offline Points: 25298	Post Options Post Reply Quote Xaltar Report Post Thanks(0) Quote Reply Posted: 05 Feb 2022 at 12:48am
	Thanks for the full parts list, it helps a lot. First up, disconnect power from the mains then pull the CMOS battery. Once you have the battery out find the Clear CMOS jumper (should be listed in your user manual) and set it to the clear position. Leave the system like this for 10 mins or so the put the jumper back to it's normal position and replace the battery. Make sure your RAM is in slots A2 and B2 and reconnect power to the system and try to power up. If you only have a single RAM module it should go in slot A2. Let us know what happens, hopefully you get a POST screen.


bde_au Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 31 Jan 2022 Status: Offline Points: 80	Post Options Post Reply Quote bde_au Report Post Thanks(0) Quote Reply Posted: 25 Apr 2022 at 3:12pm
	So after a long hiatus interrupted by my son wanting his PC back I have performed some additional troubleshooting. Luckily I have two of everything as I was updating both my sons PC's. Using the original MOBO I have swapped CPU and memory. I swapped the MOBO and did the same. Alas same behaviour. CPU and RAM lights flash on the board and the chassis fan pulses. What the heck am I missing? Oh and I used a jumper on the original config. Same behaviour. All suggestions appreciated.