Hey there,
So I have a project where I intend to power the arduino board from the internal motherboard USB2 connection. I'm just wondering if anyone here can tell me if it's always powered even when the PC is turned off? I know USB3 is because I use my front panel USB3 to charge my phone when my PC is off.
Virtusone:
Every time you hold my hand. I find another reason to fall in love with you..
Love you always. Happy Valentine’s Day.
I don't even...
It has little to do with USB 1/2/3, and more to do with the particular implementation. Many if not most machines have been "wake on key" or even mouse for some years.
Suck it and see.
AppleAssassin:
So I have a project where I intend to power the arduino board from the internal motherboard USB2 connection. I'm just wondering if anyone here can tell me if it's always powered even when the PC is turned off?
That depends on the PC...some do, some don't.
It depends on the computer, it's motherboard, jumper settings, and settings in BIOS.
Plug in your 'duino, turn off the computer and see what happens.
See, that wasn't that hard, eh ? 
// Per.
On a similar subject, where can I buy a 9pin socket to fit the motherboard USB header? I've searched Maplin's site and Farnell's (element14) site but couldn't find any.
Henry_Best:
On a similar subject, where can I buy a 9pin socket to fit the motherboard USB header? I've searched Maplin's site and Farnell's (element14) site but couldn't find any.
Make your own thread for that sort of questions. It's not a good habit to thread-jack!
// Per.
Henry_Best:
On a similar subject, where can I buy a 9pin socket to fit the motherboard USB header?
You don't, because people do not use them (to make their own leads).
You buy the complete spill module on eBay. Then again, most of us have a couple in the junk box.