audio connector

I was trying to remove a broken jack (3.5mm) from my audio panel on the top of my case, which is a Phanteks Eclipse P400 and I disassembled it until I could extract the piece that you can see here: Since I'd like to buy a replacement for this, I need to know how this is called, but I...

I am new to computer building/upgrading. I just got a new graphics card and wanted to know if this power supply I'm looking at is compatible. I'm sorry if this comes off as stupid. Graphics Card http:// PSU http://