Hi @aalrd78894,
Can you get into BIOS on startup with a display on the monitor? (press the Del key a few times after starting the PC)
If you can't get into BIOS the PC may not be passing POST (power on self test) so you may have to connect a [https://www.ebay.com.au/itm/172624805590?chn=ps&_ul=AU&norover=1&mkevt=1&mkrid=705-139619-5960-0&mkcid=2&mkscid=101&itemid=172624805590&targetid=1278430613456&device=c&mktype=pla&googleloc=9070559&poi=&campaignid=19649531412&mkgroupid=146789074798&rlsatarget=pla-1278430613456&abcId=9305371&merchantid=551043510&gad_source=1&gclid=EAIaIQobChMI4JDA8__rhQMVfCaDAx0wUAFGEAQYASABEgJvg_D_BwE|system speaker] (example only) to the appropriate header pins on the motherboard's JFP2 connector (see p.17 of the [https://www.msi.com/Motherboard/G31TMP21/support#manual|user manual] and check if there are any [https://forum-en.msi.com/faq/article/bios-beep-codes|beep codes] that will tell you what is happening