I have 2 USB Port connectors on the Shuttle AK32 MoBo. I want to use 2 more Ports by connecting a USB Cable (with 2 USB Connectors) to the Extended JP4 (or JP5) USB Connector Header (USB3~USB6. A Webcam or a Printer works well on the normal USB Connectors but neither works on the Extended USB.

Check your MBoard manual. Many boards have a mix of USB 1.1 & 2.0. That may be the issue. Or you may not have the headers connected correctly or the drivers installed.

"A Webcam or a Printer works well on the normal USB Connectors but neither works on the Extended USB." The USB ports accessed on the mboard header aren't "extended" USB - they are wired to the USB controller(s) on the mboard the same way as the physically built in ports are. Do the ports wired to the header work with other USB devices? Are you SURE you have the wiring adapter to the header wired correctly? Mboard manufacturers tend to keep the pinouts for those headers the same for many mboards, and a USB wiring adapter that came with the mboard and was manmufactured by or for the mboard manufacturer will always work with the pinouts of the USB mboard header, but the pinouts of USB headers was never standardized, the pinouts of different manufacturers may be different, and the pinouts of the female wiring connector on wiring adapters not supplied by the mboard manufacturer, or of case manufacturers, or of third party USB wiring adapters may not match the pinouts of the mboard header. Outside of that, if you are sure the wiring adapter is wired correctly, I've seen a few cases where a wiring adapter attached to a mboard header does not work with all the same devices the built in ports do, and I'm not sure why. Poor shielding? Poor soldering? The mboard wants a second ground (the port's shell) and the wiring adapter doesn't have that? I don't know what you could do about that other than try another wiring adapter, or connect the shell (the metal on the outside orf the ports/the plate it is mounted on, to ground as well as the grounds for each port. If you can plug in your USB devices such that the printer and webcam are plugged directly into ports in the mboard, and other devices are plugged into the ports in the USB wiring adapter and they all work that way, you could make do with that arrangement. I'm assuming of course that the USB controllers are turned on in the bios, and USB 2.0 is enabled for those ports if it is required by the webcam and/or printer. There may also a setting for USB 2.0 for Fast or Hi speed - Hi speed is the fastest. I'm also assuming the header USB ports are not sharing a connection with a built in USB port, such that when you have a USB device in both a built in port and one on the header they are sharing one connection to USB controller - that in effect is a hub where both ports share the 500ma available, rather than each having 500ma available - not all devices will work connected to a hub, many printers and webcams included.

Thank you, the problem was in the Cable wirings. I exchanged and put thewires in the right places and all is working OK. I also found Internet sites with good information about the USB diagrams and connections - may be usefull to others with similar problems: www.directron.com/installusb.html www.usbman.com/Guides/BelkinMotherboard_cable_assembly.htm

It's good to hear you have solved your problem. That's usually what the problem is - a mis-wired wiring adapter.