AB350M-HDV not posting with Ryzen 5 2400G

I am in the process of upgrading an older computer from a Ryzen 3 1200 to a Ryzen 5 2400G. The Ryzen 5 was from an upgrade of my son's computer.

My AB350M-HDV has been upgraded to the latest BIOS 10.08 (beta) in stages. I had up update the BIOS to 3.4, then 5.0, then 7.0 and finally 10.08. The support page shows that the board will work fine with the Ryzen 5 with at least BIOS verion P4.40.

The board posts fine with the Ryzen 3 but when I switch to the Ryzen 5 the board does not post and the fans spin up and down. I've cleared the BIOS to no avail. Going back to the Ryzen 3 the board posts fine. Any suggestions?

Thank you

Motherboard: Asrock AB350M-HDV upgraded to bios 10.08
CPU: Ryzen 3 1200 (works), Ryzen 5 2400G (doesn't post)
Memory: GSKIL DDR4-2133 8 GB (2 x 4GB)
Power Supply: EVGA 500 BQ 500 Watt
Video card: MSI RT 6500xt

All the items with the Ryzen 3 1200 posts fine. The case and power supply were reused from a build that had a different motherboard which had the Ryzen 5 2400G and an Nvidia 2060 video card so the power supply had enough power to feed the original components and the RX 6500xt should be about the same power draw.

When I put in the R5 2400G I tried both with the video card (which boots up fine with the R3 2100) and without using the built in graphics. Same results both times... fans spin up then down continually with no post nor beeps.

The only thing I've not done is try the 2400G in a different board to see if it posts, but as it was working when I pulled it out of a Gigabyte GA-AB350M-DS3H the possibility of the processor being dead would be slim IMHO

I am doing the posting outside the case at the moment as I've had to take it out and install it into the case twice.

I figured it out finally. It was a combination of technical work, old eyes, and not thinking straight

Old eyes: I think I was using the wrong 4 pin motherboard connector. I have to use readers these days and seeing the shape of the plug was hard. I finally took pictures of the connectors and zoomed in until I could see the shape of the connectors. I took the precaution of putting a small strip of duct tape on the correct connector.

Technical work: I removed the battery and also used the clear CMOS jumper.

Not thinking straight: I have to remind myself that after the CMOS is cleared it will output on the integrated graphics initially. I plugged the video cable into the HDMI connector on the motherboard. I got the fTMP is corrupt message. Once I hit Y to clear it out the board then rebooted and started outputting to the video card.

I finally got the system booted and installed Win 11 on the unit. I'm taking a victory sip now for all the frustration I had over the past few days. Thank you for your suggestions.