So, I posted about having all the parts for my new computer a month ago.

That's the big pile o' parts.
And now...

It's done!
I installed Windows 7 on it.
Specs:
AMD Phenom X4 3.2Ghz
Radeon 6200
8Gb RAM (Though, I havn't checked if it all works yet)
QUESTION FOR SOMEONE TO ANSWER
HELP
I bought a wireless card for this computer, I plugged it into a PCI Express slot (It didn't seem to have any place to put power, so I assumed it used power from the Motherboard).
I installed the driver software for it, and now it claims that it cannot detect the card.
Any help?