Do you have a seperate graphics card, or are you using the 9950x on board graphics ?
If you have a graphics card, remove it and plug your monitor into the on board (motherboard) video/HDMI port. Disconnect any USB devices (audio interface, printer etc) exept your keyboard, mouse and monitor and power. See if it will boot. If not,
shut it down (hold in the power button until it shuts down) Pull the RAM and re-seat it. Then try it.
Note: The 9950x is quite new. If the BIOS was/is not up to date, the motherboard may need a BIOS update to the latest in order to fully support that processor.
If you have a graphics card, remove it and plug your monitor into the on board (motherboard) video/HDMI port. Disconnect any USB devices (audio interface, printer etc) exept your keyboard, mouse and monitor and power. See if it will boot. If not,
shut it down (hold in the power button until it shuts down) Pull the RAM and re-seat it. Then try it.
Note: The 9950x is quite new. If the BIOS was/is not up to date, the motherboard may need a BIOS update to the latest in order to fully support that processor.