If you're having problems with USB ports, read on...

Question

i'm reading that alot of people on here are having problems with their front (or top) usb on their cases not working with their k7n2 boards.  i have come across the correct solution to this problem in one of the posts (after having solved the problem on my own), however noone has posted the solution by itself on this forum so everyone can easily see it.
The trick is to make sure that pin 10 (at least on a K7n2 delta-L), the pin labeled USBOC (USB Open Connection), is wired to NOTHING.  If the connector to your front usb ports is fused into one giant connector and it HAS a wire that will connect to this pin (labeled GND2 or Shield or something), CUT THAT WIRE.  Pin 10 on JUSB2 (at least on a K7n2 delta-L) must be OPEN.  If this pin IS connected to something (even if it is only GND), the motherboard will think something is connected to this usb port and you will get many unknown devices listed in your windows device manager and the rest of your usb ports may or may not work.
As a general rule of thumb, if a pin on a motherboard is labeled OC for "Open Connection" and you wire something to it, you're asking for trouble.
If you cannot understand this you should not be attempting to wire a motherboard in the first place. 
Here is a picture to go along with this discussion.  If you cannot see this picture, I am sorry for it has probably been removed from the place I posted it online as I cannot attach pictures physically to this post.  If someone here has a way to permanently host this picture and post it to this thread permanently, that would be wonderful.
In summary: all usb ports/headers have only four pins associated with it (VCC, USB+, USB-, GND).  If the connector (whether it's one big connector or individual sockets) to your front/top usb port has 5 sockets, don't connect the 5th socket to anything.  That goes for any case/motherboard combination.  This is what i'm talking about above.  I have no idea why motherboard and case manufacturers have a 5th pin involved in any way on either the pin or socket side.  It is not used for usb.
EDIT:  I just noticed this has already been discussed in the trouble shooting guide in the above sticky post.  oh well, now we have a pretty picture to go along with it (i hope).

Answer 1

:-D)Hello guys,
as promised I come back here to give the results of my tests... and I have to say that you saved my day (even if I had to open back 60 secured cases).
So the solution was the right one, when I unplugged the "ground" end of the front USB connector cable from the USBOC pin, those connectors finally worked as expected with USB 2.0 compliant devices.
So thank you really much for this very usefull information !
And even if maybe it's not only MSI's fault, I still believe that more information on those connectors in the user's manual would be really usefull (who knows what USBOC means except a few people and who could imagine that pluggin on it a "ground" cable would make it unserviceable ??). And who ever saw a user's manual bundled with a case ?? it's pretty unusual  
Hope that someone at MSI will read that and take it into consideration, not for me (because now I'm aware) but for the thousands other consumers that will feel a little bit "annoyed" with that issue. I don't think that adding one line about it in user's manuals would be so much expensive  
But I'm quite lucky myself... being able to understand and write english (even if I still have some progress to do  ) gave me the possibility to find the solution... but a lot of my french fellows can't do that... and there's no french forum here... How can they do ? They rely on user's manual
Best regards,
Nicolas