Cpu Debug Led Flashes - Then nothing happens.

[Hairstat]

 Just finished building my new computer(Ryzen 3 3600x, 1080, 16 GB DDR4 3200 mhz, 1 TB NVME Storage, MSI b450 Tomahawk) last night I booted it to bios updated it to 7C02v1D(latest). I came back this morning and now the mobo will flash the CPU debug light and thats it. It spins all the fans besides GPU(Probably because it doesnt boot to GPU>??). So Im not sure why over night I could boot to bios fine and now it cant get past the CPU debug light. (I have tested it with both a ryzen 3 1200, and my new 3600x both do not get past the CPU debug light, while last night both booted to the bios).

[TheGlenlivet]

Did the system ever boot?  Like with the old 1200?  Or is this all new?

[Hairstat]

The system booted when I first put it together with the 1200 so I could install the latest bios update - after installing new update I put the 3600x in and booted it to bios. Then I shut it off and now neither will boot.

[TheGlenlivet]

If you've already reseated the CPU I would try an dboot it with just one stick of RAM, the GPU and the SSD installed, nothing else.  

Also,  you said the CPU light is flashing, not constantly lit?  I thought it stays lit if there is an issue.

[Hairstat]

It flashes once or twice then no other debug light flashes. No input comes to the monitor, I have already reseated, tried 2 different sticks of ram at different speeds.

[Hairstat]

For now I am going to try and boot via a friend system, see if it is my mobo or something.