This will deff. do it. I have my cable box hooked to these speakers, for the money even being computer speakers they are incredible and I have heard surround sound systems that cost over $800 and they sound just the same. I also have these connected to my xbox 360
I actually just did this to my set. I have had this logitech speaker setup for well over 5 years now, and I just early yesterday morning thought to myself...wonder if adding 2.0/2.1 speakers would work. For my setup, it did. I simply plugged the 5.1 into three of the jacks (I selected Center/sub (orange), Rear (black), and Side (green cable plugged into grey due to the 2.0 speakers having shorter wire). Then I simply added the 2.0/2.1 speakers into the green jack. You will need to play with speaker audio levels on your computer, but for me, they worked well. I tested in Fallout New Vegas and Batman A.A. and it was great. Can't believe I didn't try this earlier.
No it will not, you need separate connection for a 5.1 system. You either need a high end laptop with the yellow/green/black connectors or a desktop with a sound card or built in sound card. If you have a Dell 630 your only option is to get external sound would be to go with a system that connects though USB.
Just use the RCA cables that came with the ps3, and set the audio feature under "settings" to RCA. Your ps3 will still display with hdmi cable and then output audio with RCA. Also if you're using RCA to output audio, be sure to buy one of these with this specific speaker system http://www.amazon.com/Console-Adapter-Convert-Plugs-Single/dp/B0006U3ACY/ref=sr_1_1?ie=UTF8&s=electronics&qid=1263445395&sr=1-1
This adapter will give your ps3 5.1 channel surround sound without having to use the lame matrix mode.
At this time there is no problem with any of the speakers. I may have had the subwoofer unplugged while cleaning. This is a very good system for the price. I'm in a fairly small room (office) and when I blast away it's like "being there."