Try connecting a device to the port while the PS3 is powered off, then power it on. If the device is still not detected then you probably have a dead port; and there is really nothing much you can do about it besides repair/replace it yourself.
Also, have you tried connecting to the other USB ports? If non of them work then you may have caused a power surge in the system. In this case I suggest you contact PlayStation Customer Service. They will probably say something along the lines of "If the USB ports are malfunctioning there isn't much you can do besides replace the system" but its worth a try.
Hope this helps.
Ok so I plugged my iPod in to charge through the ps3 and something came up about USB devices, didn't quite read it in time. Now my controller and mic won't Charge when I plug them in. Any solution?
Did you shutdown and restart the machine?
Overloading USB ports will cause the ports to stop working but this should only be temporary. Restart the machine, try just one device at a time to check if the ports still work.
You can charge your mics and controllers in a PC USB port.
Any 5-Pin Hi-Speed USB 2.0 Mini-B cable will work.
You can get these cables at most stores which sell electronics.
I'm having a similar problem. BUT Since christmas i have been charging both my iPod and Controller with my ps3. I have not had any problems until last night. My XMB says "Maximum amount of power has been sent to USB devices. Remove atleast one device." I don't know what is wrong. And unless i didn't notice it all my USB stuff is in good condition. Neither of my two controllers will charge though. My friend said it might be a battery problem but one of my controllers has been used about 4 times. Will its battery screw up if i leave it dead for to long? If so then the one i have been trying to use would've been screwed up long ago.