My first PC - an Acer 486 had a plastic case. It's also why I kinda screwed up the construction of my second PC - studied the construction of the acer one, saw

My first PC - an Acer 486 had a plastic case. It's also why I kinda screwed up the construction of my second PC - studied the construction of the acer one, saw it was screwed into the case. So I screwed the new motherboard into the new case... I couldn't figure out why it wouldn't power on. Took it to a friend's place, he just about fell over laughing when he realised I'd missed the copper risers.