Upgrading

Unplug everything. Plug everything back in. Wait one more year. 

OP,

To put in your system you want to click on your USERID then your profile then on your usreID again. You are looking for Your Virtual System. It is a bit confusing… just keep clicking around your USERID and you will bump into it.

Generally speaking, agree with power cords first approach. In other words, first thing to do is to improve power supplies, if possible. I would do speaker cables last unless what you currently have is just substandard junk.

Power cords, Interconnects, then speaker cables is my recommendation.

Try to get a full loom going if you can swing it. (Avoid "Cable Stew" of all different mixed/matched brand names/types. Though I admittedly have a couple of different PC’s in my setup at the current time.)

Used Cables on the ’net are good folks, and I highly recommend them.

Unless cable vendors are intentionally screwing with frequency response requiring another of their cables to fix the other ones, then a full loom is not supportable by any logic.