Identify desktop PC ports (part 2)

Note: this is a follow-up to another thread posted yesterday and located here:

        Identify desktop PC ports

Hello,

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?

Thanks

2018-09-05a.png2018-09-05b.png2018-09-05c.png
WeThotUWasAToadAsked:
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William FulksSystems Analyst & WebmasterCommented:
X - cutout for a power supply
K, L - PS2 ports for a keyboard and/or mouse
M - USB ports (most likely 2.0)
N - Optical audio port
O1 - blurry but looks like an eSata port
O2 - Firewire port
O3, O4 - USB ports (most likely 3.0)
P1,2 - USB ports (most likely 2.0)
P3 - Ethernet port
Q - USB ports
R - All audio ports - subwoofer, mic, left/right/rear speakers, input, output - Hard to tell without labels
S,T - Displayport
U - HDMI
V - Displayport
W - DVI-D
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William FulksSystems Analyst & WebmasterCommented:
As far as what's replaceable, I'd say none of them unless you are really good with a soldering iron. They are attached directly to the motherboard and really not meant to be replaced. If, for example, the Ethernet port went out it would be cheaper to just buy a card or USB to Ethernet adapter than risk damaging the motherboard to fix it.
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WeThotUWasAToadAuthor Commented:
Thanks William. That's just what I was after.
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