X670E PG Lightning no POST on cold boot

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   Latest BIOS 3.50 is not targeted at this issue.

My research shows most users with similar issue can pass a cold POST only if they run the PC for a while and then restart it. So this is most likely a power delivery on start issue. 

E.g. faulty PSU voltage line to CPU or mobo, faulty BIOS battery, anything related to voltage power droop when capacitors are discharged for cold boot (could be PSU, CPU or Mobo hardware problem). 

Problem may be partially or fully remedied by swapping components or changing voltage settings in BIOS.

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vrock442 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 19 Sep 2025 Status: Offline Points: 90	Post Options Post Reply Quote vrock442 Report Post Thanks(0) Quote Reply Posted: 9 hours 40 minutes ago at 4:13pm
	Latest BIOS 3.50 is not targeted at this issue. My research shows most users with similar issue can pass a cold POST only if they run the PC for a while and then restart it. So this is most likely a power delivery on start issue. E.g. faulty PSU voltage line to CPU or mobo, faulty BIOS battery, anything related to voltage power droop when capacitors are discharged for cold boot (could be PSU, CPU or Mobo hardware problem). Problem may be partially or fully remedied by swapping components or changing voltage settings in BIOS.

Limpster Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 5 hours 29 minutes ago Status: Online Points: 15	Post Options Post Reply Quote Limpster Report Post Thanks(0) Quote Reply Posted: 5 hours 14 minutes ago at 8:39pm
	Just wanted to chip in and say that I got the same issue after updating the BIOS to 3.40 (and also 3.50) with cold boot. Downgrading to 3.30 solves the issue. Had the same issue back in the day with my ASRock Z170 OC Formula after cold boot, never solved it (even changed CPU, RAM, Power Supply and GPU without success) and got myself another board (different brand), worked plenty of years without any troubles with the new board. I don't see the point in changing my hardware when the problem is -as it seems- BIOS related. My components are brand new, working flawlessly with 3.30. The issue is the BIOS or some setting (related to the newer BIOS versions) which I coulnd't figure out yet. The problem only occurs to me when shutting the pc down and cutting the power completely (removing power cord/switch the power strip off), but if I just shutdown the PC and restart it the next day/hours later without cutting the power, it boots fine (no such issue with 3.30). It also doesnt matter if I leave the RAM at default settings (=not EXPO/OC related in my opinion), PC won't boot after cutting the power.