Hi
Smoggers and Welcome to the Forum
If the DRAM_LED stays lit during the POST cycle then there is an issue with your RAM and POST will not continue till the error is fixed. Just because your Dimms work in another system does not mean they will work with yours.
Your MB supports up to 4866Mhz so no problems there however your Ryzen 5 5600g supports up to 3200Mhz. This maybe your problem as there is no guarantee you will reach the rated speed of 3600Mhz OC due to the limitation of the IMC (Integrated Memory Controller) on your chip.
To check for a memory mismatch please list the P/N or SKU of the RAM kit your using? The P/N will be located on the packaging or on the modules themselves.
An update to Bios and Chipset is recommended however from what you describe the Flashback was unsuccessful if the flashback button remains lit solid.
Issues with flashback are commonly:
- Incorrect format for your USB which must be FAT32 single partition.
- Wrong USB port used. (Check your manual page 1-7 for rear I/O features and you must use port 2)
- Bios file not renamed correctly (rename to TGB550PW.CAP before transferring file to USB
- System has to be shut down so there is only power to the MB.
If you can get into your Bios then you can use the EZ Flash3 utility to update Bios. In this case any USB port can be read.