No USB devices working on MSI B450 board

[samapico]

I just got a MSI B450 Gaming Plus motherboard and a Ryzen 3700X. I had to use the BIOS Flashback to update it to a version that supports the CPU.

 

I tried all 3 available BIOS versions that support the Ryzen 3000's: v18, v19, and v1A. In all cases, I cannot get any USB devices to work once the computer boots in Windows (7, x64).

 

The mouse and keyboard work fine in the BIOS, but I can't do anything in Windows, not even install the motherboard's drivers, which might be part of the problem. If I put the driver CD in, I get a prompt about the autorun, but I cannot accept it. I tried all USB ports (2.0, 3.0, front panel, rear IO). I tried all BIOS options related to USB (XHCI hand-off enabled/disabled; Legacy mode enabled/disabled/auto).

 

I even tried using a USB -> PS/2 adapter, didn't work either.

 

 

Here are some ridiculous ideas that I did not try yet:

 

- Put the hard drive in another computer, and manually put the driver files somewhere that Windows will automatically find them? If that is even possible?

- Run the OS on another computer, configure Windows to always execute autoruns, put the OS back in the new computer, and run the MSI CD

 

Oh, and the network driver is also not working, so I can't work on it remotely.

 

The only thing that works is my GPU (GTX 970) seems to have found the proper drivers, and my 2 monitors show up at the right resolution. Right now, my PC is a heavy and expensive brick that displays a wallpaper

 

Any ideas?

[191x7]

Windows 7? Now, why did you get the idea a modern system like that could run such an old OS that's losing support soon? 

 

The solution is rather simple, install Windows 10. Your USB controller is too new for Win7 to have drivers.

[samapico]

There are Windows 7 drivers on MSI's website, though. I figured it would just work. The official specs from MSI even list Windows 7 as a supported OS.

 

Anyways... I guess I was waiting for a good reason to update to Windows 10...