Question New CPU and motherboard, PC won't turn on

[uchiharecker]

Hi all, I got a 5800x and a b550m ds3h for it and installed them however my PC won't turn on. There are 2 things that come to mind : the BIOS may not support the 5000 series processors, however on the box of the mobo it says ''amd ryzen 5000 desktop ready'' so I don't think that's it.

The other thing is that the motherboard has an 8 pin input for the cpu power, however my PSU only has a 4 pin connector. From what I've read online this shouldn't be an issue, but I can't find any other reason why the PC wouldn't be turning on. And when I say it doesn't turn on, it doesn't turn on at all, the fans don't even spin.

 

[LinuxDevice]

There are several motherboards which support newer CPUs...but only if the BIOS is flashed to a sufficiently current revision. However, don't believe what you've read about not needing an 8-pin connector (unless you have two 4-pins designed to fit together as an 8-pin...then it is really an 8-pin capable of working like a 4-pin). You need full power before you can conclude power is sufficient.

 

[uchiharecker]

There are several motherboards which support newer CPUs...but only if the BIOS is flashed to a sufficiently current revision

I don't think that's the problem since it says ''Ryzen 5000 desktop ready'' on the box of the motherboard.

You need full power before you can conclude power is sufficient.

So after I get a new psu with 8 pins or an adapter with 8 pins it should work?

 

[LinuxDevice]

''Ryzen 5000 desktop ready'' only applies to the hardware. A large number of motherboards exist "out in the wild" which need a BIOS update to work with all of the CPUs their specification allows. However, I don't think you can consider that until the power is correct.