On AMD, in the latest BIOS revision, the Q Code LED was changed to show CPU temperature. Sounds like the same is true on Intel. There should be a BIOS option that you can set it to show "POST codes only" somewhere.
It's not a problem, it is intended behaviour. Q-Codes are only relevant during POST, and don't show anything useful once the OS is running. The new behaviour makes the display useful by showing CPU temperature after the BIOS hands control to the OS. If you disable the new behaviour, you will not get any useful diagnostic information from the display while the OS is running, it will just sit on the final Q-Code from POST.
I was looking for a fix myself and finally found one!! Go into BIOS, and under the advanced tab, find onboard device configuration, then under the Q-Code LED function, make sure it is set to POST Code Only. That fixed my problem. Once your computer boots up, it should be an AO in the led, and that means all good. I hope this helps, have a good day.