Hi @nicholaskeck
No video ,may be due to the PC not passing POST (power on self test) when starting. If there are any beeps heard the code will tell you what the problem is.
* For the Asus motherboard try connecting a [https://www.ebay.com.au/itm/144834979488?chn=ps&_ul=AU&norover=1&mkevt=1&mkrid=705-139619-5960-0&mkcid=2&mkscid=101&itemid=144834979488&targetid=2365752142950&device=c&mktype=pla&googleloc=9070542&poi=&campaignid=21776459266&mkgroupid=171915223801&rlsatarget=pla-2365752142950&abcId=10047394&merchantid=548725494&gad_source=1&gad_campaignid=21776459266&gclid=EAIaIQobChMIvML-zu6RjgMVkOEWBR3GpQr3EAQYAyABEgJrI_D_BwE|system speaker] to the speaker header pins on the System Panel connector (20-8 pin panel) - see p.1-31 (43 of 86 pdf) of the [https://dlcdnet.asus.com/pub/ASUS/mb/SocketFM2/F2A85-M/E8005_F2A85-M.pdf|user manual] and check if there are any [https://www.asus.com/support/faq/1029959/|beep error codes] heard.
* For the ASRock motherboard connect it to the Power LED and Speaker Header (SPK_PLED1) header pins - see Item #14 on p.7 (13 of 87 pdf) for location of connector and p.30 on (36 of 87pdf) for the actual pins in the [https://download.asrock.com/Manual/B450Mac.pdf|user manual] Here's a link for the ASRock [https://www.asrock.com/support/index.asp?Model=beep|beep codes]