I have a CASE that had an i/o port module included http://silverstonetek.com/products-fp31.htm. The module has 4 USB ports. 2 of the USB cables I plugged into my motherboard header. The other 2 cables are plugged into the internal ports of my USB PCI card via an adaptor cable. The 2 ports plugged into the PCI card don't work properly. I plug in a memory stick, Windows XP Pro recognizes the memory stick, the computer runs really slow, then nothing. The ports work fine when plugged into the motherboard header. Why won't the USB ports work when plugged into the PCI card?
what cables are you plugging in via the adapter? And what type of adapter are you using?The adapter cable (USB 2.0 Motherboard Header Device to A Type USB Port Adapter/Cable - M/M) is at http://www.xpcgear.com/pinhead2usb.html. The cable has no electronics.

Are you sure those are all USB ports? The description says you bought the FP31 (two USB and a Firewire)?Sorry, posted the wrong link, http://silverstonetek.com/products-fp32.htm is the correct one. It has 4 usb ports.Timrod:

Did you check Device Manager to see if any PROBLEMS are reported for the USB expansion card?

Did you check the manufacturer's Web site for any recent Windows XP device drivers for the card?

DocBeware, USB header pinouts can and do vary. There seems to be little in the way of a standard.
Check that card pinout is compatible with the cable you have.DOC: There were no problems in the Windows device driver. No drivers were at the manufacturers website. I emailed them to see if there were any available.

Backdated: I checked each of the 5 pins on the cable and they match the i/o module pinout which also matches the mobo header. Pin1: usb power, pin2: usbp-, pin3: usbp+, pin4: gnd, pin5: nc.

When I insert a memory stick it will work, I can see and browse the files, but then the system runs really slow, then almost locks up the computer until I remove the memory stick.

Do you think the I/O module has electronics in it for the USB portition or is it basically a cable?

The internal usb ports on the pci card still worked as I just checked them with a memory stick.

I was playing with it again and received a new error stating windows doesn't recognize the device and drivers aren't loaded. I double click on the device and it says the drivers aren't loaded. This is weird because no drivers were ever loaded for this besides what came with Windows XP Pro and this is the first time I've seen this particular error. It's also wierd because I just used this port and it was fine. I reset the cable and it works-kind of.

Could the resistance in the cables be too high between the I/O module, the adapter cable, the pci card, and the usb device? If that's not it, it's got to be something weird with I/O module.
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Could the resistance in the cables be too high between the I/O module, the adapter cable, the pci card, and the usb device? If that's not it, it's got to be something weird with I/O module.

...The other 2 cables are plugged into the internal ports of my USB PCI card via an adaptor cable. The 2 ports plugged into the PCI card don't work properly. ...