I just built my first gaming desktop. I've put all the parts in the right places (at least I believe so) powered it up, fans run, ram w/RGB lights light up, keyboard works with caps lock light (on and off) but nothing shows up for my display? I have no idea what the problem is... I'm using a TUF B450-PLUS GAMING MOTHERBOARD and don't know what is going on. PLEASE HELP.