Hi, [br]
It sounds like the PC is not passing POST (power on self test)
What are the RAM specs?
Try connecting a system speaker to the motherboard to check for any beep codes on startup.
On Asus motherboards:
''No beep'' from the speaker check that the CPU and memory are installed correctly and there's no oxidation on the connection parts. If there is any oxidation, try to wipe the oxidized part with an eraser. If it still cannot be turned on properly, clean it with contact cleaner and re-install.
''1 long beep followed by two short beeps'' indicates a memory problem. Check that the memory is correctly installed.
''1 long beep followed by three short beeps'' indicates a graphics card problem. If the graphic card needs an extra power supply, ensure graphic card has the power connected to it.
Here’s an image taken from p.1-15 of the [https://dlcdnets.asus.com/pub/ASUS/mb/SocketAM4/PRIME_X370-PRO/E12577_PRIME_X370-PRO_UM_v2_web_only_20170712.pdf|user manual]that shows where the speaker connect to on the motherboard. There is also an image that shows the kind of speaker that you can connect to the header pins
[image|2041078]
[image|2041084]
(click on images to enlarge for better viewing)