Note: this is a follow-up to another thread posted yesterday and located here:
Identify desktop PC ports
Yesterday I posted images of the front of my computer and shown below are images of the back. If someone could identify the ports labeled by letters (and numbers), as well as which of them can be replaced individually if faulty, I'd appreciate it.
By the way, the panel near the top (labeled x in the first screenshot) appears to be removable. What type of component is that designed for?
Also, I've always been curious about the multiple different-shaped (but mostly rectangle) openings in the video card (see 3rd image). Do they have some purpose?