Hello. I recently bought ryzen 7 2700x and was trying to run it on MSI b350m Mortar and its not working. What i should do? Buy new motherboard?

update the BIOS / UEFI

Probably your BIOS version doesn't support the new Ryzen CPUs.

So, you have to update your BIOS with old Ryzen CPUs.

You can try several methods for this:
1) Borrow old Ryzen CPU from your friend and update BIOS.

2) Go to local service of MSI. They can update BIOS.

3) Go to your seller. Maybe they can help you.

4) Request bootkit from AMD. Here is the link:

Unable to Boot New Desktop System Configured with AMD 2nd Generation Ryzen™ Desktop Processor, and AMD Socket AM4 300-Se…