Changed the RAM speed, computer now won't work.

The computer was working properly. Just discovered that I had to change the RAM speed manually in the BIOS to get it to run at its marketed speed. So that's what I did. I changed the speed to 3600. Now the PC won't POST, the monitor is blank.

After reading online I gathered the solution was to clear the CMOS/reset BIOS. I tried numerous techniques, the last being unplugged the PSU, took the CMOS battery out, and left it out overnight. Now POST get stuck at "boot" (observing motherboard's POST status checker), then when I restart it, the monitor will show the motherboard logo and the text below saying press F2 or DEL to go to the BIOS, then the computer will immediately restart and repeat the same thing. Pressing F2 or DEL doesn't do anything.

My setup
CPU: AMD Ryzen7 3700x
Mobo: ASROCK B550m Pro4
RAM: Corsair Vengeance RGB Pro 32GB(2x16GB) CMW32GX4M2D3600C18
Graphics: GTX960
OS: win10

Good advice from muziqaz.
Good luck with getting your Corsair ram to run at 3600Mhz. I have a B550 Phantom Gaming 4 MB with 4 x 8GB sticks of Corsair Vengeance 3600Mhz ram. I have not been successful at setting the ram's XMP profile. It defaults to 2166Mhz. Best I can do is run it at 3200Mhz. Like yours sometimes it would get stuck in a boot loop and I would have to use only one stick of ram and clear CMOS to get back into the bios.
I have tried flashing it to different bios but still stuck at 3200Mhz.
If interested you can read what I have tried in these threads:

http://forum.asrock.com/forum_posts.asp?TID=14261&KW=&title=ram-your-using-on-phantom-gaming-4-board

http://forum.asrock.com/forum_posts.asp?TID=16936&KW=&title=b550-phantom-gaming-4-a-c-ram-issue

how much ram is in it, cause i had to lower the speed due to 128gb in a x399 taichi , read the manual related to ram configuration oh and usual if the system does not boot, setting too high , latest bios?

texasbeefnoodles wrote: The computer was working properly. Just discovered that I had to change the RAM speed manually in the BIOS to get it to run at its marketed speed. So that's what I did. I changed the speed to 3600. Now the PC won't POST, the monitor is blank. After reading online I gathered the solution was to clear the CMOS/reset BIOS. I tried numerous techniques, the last being unplugged the PSU, took the CMOS battery out, and left it out overnight. Now POST get stuck at "boot" (observing motherboard's POST status checker), then when I restart it, the monitor will show the motherboard logo and the text below saying press F2 or DEL to go to the BIOS, then the computer will immediately restart and repeat the same thing. Pressing F2 or DEL doesn't do anything. My setup CPU: AMD Ryzen7 3700x Mobo: ASROCK B550m Pro4 RAM: Corsair Vengeance RGB Pro 32GB(2x16GB) CMW32GX4M2D3600C18 Graphics: GTX960 OS: win10

It seems like the manual RAM speed adjustment has caused instability, and clearing the CMOS hasn't fully resolved the issue. Here's how you can troubleshoot further:

Recheck CMOS Clearing Process:

Double-check that you properly cleared the CMOS. After removing the battery, ensure the system is unplugged, and press and hold the power button for 10-20 seconds to fully discharge any residual power. Then, reinsert the battery and try booting again.
Boot with One RAM Stick:

Remove one of the RAM sticks and try booting with just one installed in the primary slot (consult your motherboard manual for the correct slot). If it doesn?™t work, try the other stick.
Force BIOS to Default Settings:

If you get to the BIOS splash screen, try pressing Ctrl + F2 (some ASRock motherboards have this shortcut to load fail-safe defaults). If that doesn?™t work, try a full system power cycle:
Power off and unplug the PSU.
Hold the power button for 10-20 seconds.
Plug back in and restart.
Reduce RAM Speed:

If you manage to get into the BIOS, manually set the RAM speed to a lower value (e.g., 2133 MHz) and see if the system boots. Once stable, you can incrementally increase it to find the maximum stable speed.
Update the BIOS:

If your system boots with default settings, check if a newer BIOS version is available for your motherboard. Many updates improve RAM compatibility and stability. Follow the manufacturer?™s instructions carefully to update the BIOS.
Disconnect Non-Essential Components:

Remove everything non-essential, including additional storage drives, USB devices, and even the GPU (if your CPU has integrated graphics). Try booting with just the motherboard, CPU, a single RAM stick, and primary storage.
Test in Another System:

If you have access to another compatible system, test the RAM sticks there to rule out hardware failure. Similarly, try using known-working RAM in your system.
Check PSU and Connections:

Ensure all power cables (CPU and motherboard) are securely connected. A weak or faulty PSU can sometimes cause boot loops.
If none of these steps help, you may need to seek professional diagnostics to check for potential hardware issues, like a faulty motherboard or RAM.