Upgraded PC but won’t boot

[owenegan19]

Just upgraded my CPU to a Ryzen 5900x from a 3600. Updated BIOS for my B450 Tomahawk Max to the latest before changing but it will not boot with the new CPU installed.

Any ideas as to why?

 

[owenegan19]

Can you describe more detail about what "not boot" means please, e.g. black screen with all fans running? BIOS displays but windows doesn't load?

Did you change the cooler, memory or anything else?

PC powers on, fans running and RGB parts on. But no display shows up, not black screen like it’s outputting something but a no signal message on my monitor.

Changed the cooler from the stock cooler to another

 

[owenegan19]

Does your computer have anything on it? E.g. do you have a Windows 11 install with secure boot and TPM enabled?

If you don't have any reason to fear for your Windows install, I would try clearing the CMOS as a first step.


Does it have a different mounting mechanism?

Yeah it has Windows 11 and I believe those are enabled, have all my data on it too I don’t know if that’s any issue

Yeah the new cooler has extra mounting mechanism that rise it up a bit