Hey guys. I’m a total noob when it comes to PCs. I’ve just bought my friends PC Specialist computer off him but there is no display on the monitor. I’ve tried HDMI, Display port and DVI-I to VGA connections and none of them seem to work. When powering up the computer makes a long ish beep followed by 3 short beeps then another long ish beep. Wondering if this has anything to do with it. Any help would be amazing. Thanks!