You need BIOS Version 7D53v12.zip or newer for your new processor to be recognized and to boot up.
128GB of RAM is not common on most Motherboard QVL Lists for RAM. Is your RAM listed on MSI SUPPORT Mobo QVL List for the 5000 series processor by any chance?
Here is the entire QVL list for RAM for Corsair for the 5000 series processors. There are only 2 RAM Part Numbers that support 128GB@3200Mhz: https://www.msi.com/Motherboard/MPG-X570S-EDGE-MAX-WIFI/support#mem
![Screenshot 2023-02-03 150526.png](/skins/images/7BB71D8A12F590F1D64566725362659C/responsive_peak/images/image_not_found.png)
I would just try to boot up with one stick of RAM in A2 DIMM Slot to see if it boots up or not.
What Motherboard Trouble LED lights or Digital Codes or Beep sequence are indicated when it doesn't boot up?
Make sure all the power cables from the PSU to the Motherboard are connected or it won't boot up.
All of the above is just probably verifying everything that you have done already.
I would use BIOS to find out if it is the CPU or RAM that is causing the issue by disconnecting all hardware from the Motherboard except the PSU, CPU, Windows Drive and apply power.
IF the CPU passes the POST BIOS Test the CPU Trouble LED or Digital Code should go out and the DIMM Trouble LED or Digital Code should indicate DRAM issue (no RAM installed). This would indicate that your CPU passed the BIOS test at POST.
Add one stick of RAM to DIMM Slot A2 and see what Trouble LED or Digital Code is showing. Continue until you have isolated the issue to a specific hardware.