B450 Gaming-ITX/ac+ 3600 no POST on 10.50

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   Chiming in here, as I am having the same/similar issue. I have the Fatal1ty AB350 ITX board, was running 10.31 for the last year with a 3700x. I wanted to run a 5500x3d (this is a secondary system for me thankfully). I upgraded to 10.50 and it has not posted since. I even used a CH341a to erase the bios chip and put the 10.50 bios on clean. The only cpu that posts is my old ryzen 5 1600. I have tried the 3700x, 5500x3d, and even a 5800x. When I change settings in the bios with the 1600 (i.e. turning of global c state control, setting pcie gen 3, or turning off fTPM) the cpu fan spins on intial power and then stops, clearing the CMOS leads to a boot loop every 30s. Hoping maybe you have made some progress here.

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apbarlow4 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 3 hours 10 minutes ago Status: Offline Points: 15	Post Options Post Reply Quote apbarlow4 Report Post Thanks(0) Quote Reply Posted: 3 hours 6 minutes ago at 10:34am
	Chiming in here, as I am having the same/similar issue. I have the Fatal1ty AB350 ITX board, was running 10.31 for the last year with a 3700x. I wanted to run a 5500x3d (this is a secondary system for me thankfully). I upgraded to 10.50 and it has not posted since. I even used a CH341a to erase the bios chip and put the 10.50 bios on clean. The only cpu that posts is my old ryzen 5 1600. I have tried the 3700x, 5500x3d, and even a 5800x. When I change settings in the bios with the 1600 (i.e. turning of global c state control, setting pcie gen 3, or turning off fTPM) the cpu fan spins on intial power and then stops, clearing the CMOS leads to a boot loop every 30s. Hoping maybe you have made some progress here.

darren2026 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 27 Apr 2026 Status: Offline Points: 90	Post Options Post Reply Quote darren2026 Report Post Thanks(0) Quote Reply Posted: 2 hours 17 minutes ago at 11:23am
	Hello apbarlow4, Sorry to hear you are having a similar issue. Your boot loop symptom sounds exactly like the issue I was having. I have reached out to Asrock support on April 26 2026, but have not gotten a response (nothing in my inbox or junk folder). So unfortunately no progress there. At this point, I'm not sure when or if they will get back to me. If they do I'll be sure to reply here. As for my system, I stuck with the AMD Ryzen 5 5500 as my system was able to POST with that CPU. Not really a great solution per say, but a work-around that got my system working again. Some thoughts that come to mind: 1) Have you tried flashing the BIOS chip to an older BIOS version? (nice, you have a CH341a programmer) 2) It's curious that the Ryzen 5 1600 POSTs but none of the others work. They are all chiplet-based. (Ryzen 5 1600 is PCIe3.0 only?) It makes me curious if the Ryzen 5 5500 would POST on your system (I know you don't have it unfortunately).