B550M-ITX/ac no display, no beeps

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   B550M-ITX/ac no display, no beeps on power up

Board: B550M-ITX/ac
CPU:Ryzen 5 4600G
RAM: 1 x OWC 16GB (OWC2R9D42R816GB)
PSU: 12v 160W Pico ATX

I've only got the power, CPU, RAM, a speaker and a fan plugged into this mobo.  My monitor says no signal over HDMI or DisplayPort, but the fan runs so there's power to the board.  If I pull the RAM, I get 3 beeps as expected.  This CPU is supposed to be supported for all BIOS versions and has internal graphics, which I why I chose it.  I've reset the CMOS, tried different RAM, tried each RAM slot, read all the forum posts I could find about this board.  Both the 24-pin ATX and 8-pin 12V power connectors are plugged in.

What else can I try to get this board to boot?

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MacKtheHacK Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 20 Nov 2025 Status: Offline Points: 30	Post Options Post Reply Quote MacKtheHacK Report Post Thanks(0) Quote Reply Topic: B550M-ITX/ac no display, no beeps Posted: 20 Nov 2025 at 4:45am
	B550M-ITX/ac no display, no beeps on power up Board: B550M-ITX/ac CPU:Ryzen 5 4600G RAM: 1 x OWC 16GB (OWC2R9D42R816GB) PSU: 12v 160W Pico ATX I've only got the power, CPU, RAM, a speaker and a fan plugged into this mobo. My monitor says no signal over HDMI or DisplayPort, but the fan runs so there's power to the board. If I pull the RAM, I get 3 beeps as expected. This CPU is supposed to be supported for all BIOS versions and has internal graphics, which I why I chose it. I've reset the CMOS, tried different RAM, tried each RAM slot, read all the forum posts I could find about this board. Both the 24-pin ATX and 8-pin 12V power connectors are plugged in. What else can I try to get this board to boot?

MacKtheHacK Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 20 Nov 2025 Status: Offline Points: 30	Post Options Post Reply Quote MacKtheHacK Report Post Thanks(0) Quote Reply Posted: 22 minutes ago at 4:36am
	Hi all! I'm getting the same behavior with an A520M-ITX/ac mobo with the same 4600G. I've verified the display and HDMI cable work with another computer. The CPU list for both mobos say the 4600G is supported for all BIOS versions, so I shouldn't have to update the BIOS, which is what has seemed to work for others using these boards but different CPUs supported by later BIOS versions. I'm not sure what BIOS version I have because I can't find a sticker with it. The only stickers on the WiFi shield don't have anything like a Pn.nn on them. I've actually tried this on two different B550M-ITX/ac boards and the A520M-ITX/ac and got no display or beeps. All breadboarded with only power, CPU and RAM in them. Does anyone have any suggestions for me?