PC Rebooting after hardware changes

[Trilemma]

Hi,
Just changed a motherboard, CPU and installed some new RAM on a PC. It now fires up and all fans are turning but it cuts out after 5 seconds and the fans flash. The PC then tries to boot again on it’s own and the same issues occurs.

OLD PC

Intel i5 3330
Gigabyte H61M-DS2
16GB DDR3 RAM

NEW PC

AMD Ryzen 5 5600x
Gigabyte B550 Gaming X V2
16GB DDR4 RAM

Any idea’s why this is happening?

[PeterOz]

What are the power supply specs E.g Cooler Master 850W Gold V2 NOT E.g 850w.
What is the make and model of the Graphics card (GPU)
What speed is the DDR 4

[Bruce]

@Trilemma - any update?