Hi
Some other things to try:
* Connect a [https://www.amazon.com.au/outstanding-Internal-Speaker-Computer-Motherboard/dp/B07Q42WH3C|system speaker] (example only) to the JFP2 header pins on the motherboard (see p.12 and p.16 of the [https://download.msi.com/archive/mnu_exe/mb/PROZ690-AWIFIDDR4_PROZ690-ADDR4100x150.pdf|user manual] for location and connection details) and check if there are any [https://forum-en.msi.com/faq/article/bios-beep-codes|beep error codes] heard on startup. I'm wondering if the PC is passing POST (Power On Self Test)
* If you have a DMM (digital multimeter) check that the PSU voltages are all OK by doing the [http://support.antec.com/support/solutions/articles/1000015319-is-my-power-supply-dead-the-paperclip-test|paperclip test]