I have a moderately long HDMI cable running to a screen that has worked for quite a while. Recently the screen lost its connection. I replaced the cable with the exact same model of HDMI cable, and its all good. The cables arent frequently inserted or removed, and they are otherwise in good condition. I have no idea how or why this could happen. Any ideas?
Probably reasonable quality if they are dell supplied ones. Apologies, when you said they were long I thought they might have been some funny make with potentially questionable standards interpretation. If the cables aren’t moving around, under tension or being squished/crushed they should be one of the last things to fail, and a reseat should fix most issues.