No signal (Ryzen 5900x)

[Alexandar-T]

Hello community,

 

Im building a PC:

 

ASUS ROG STRIX B450 F

AMD Ryzen 9 5900x

G.Skill TridentZ RGB(F4-3600C18D-32GTZR)

Samsung 980 Pro 2TB NVME 

MSI GeForce RTX 3060 Ti

Corsair RM1000x

 

The build was flawless without any Problems,

but when I try to boot there is no signal and the Yellow lamp on the Mainboard is on is that normal?

Can someone try and help me find the Problem?

 

[Eigenvektor]

The B450 probably needs a BIOS update to support Zen 3. As far as I could find, the board does support BIOS flashback, so you should be able to update the BIOS without a supported CPU. You need a FAT32 formatted USB stick with the current BIOS on it, then press the Flashback button after powering on.

 

This is for the B450-F Gaming II, but should hopefully apply to yours as well:

 

[Alexandar-T]

Sadly I have the ASUS ROH STRIX B450 F Gaming (Gen 1) so I can’t do this Option sadly, can you recommend me a other Solution?

[Eigenvektor]

4 minutes ago, Alexandar-T said:

Sadly I have the ASUS ROH STRIX B450 F Gaming (Gen 1) so I can’t do this Option sadly, can you recommend me a other Solution?

In that case you have to use an older, supported, CPU to update the BIOS before you can use the new CPU. Take a look at this page from AMD: https://www.amd.com/en/support/kb/faq/pa-100

 

You may be able to get a "Short Term Processor Loan Boot Kit" from AMD. They basically loan you a CPU which you can use to update the BIOS, before using your own CPU.