I believe I need a larger power supply for my HP 7975. I have a USB2 card installed and my San Disc memory card reader does not read the memory card most of the time. I called San Disc tech support and they said that my problem probably was that I did not have enough wattage supplied to the reader. Does anyone have any idea as to what my problem would be if it is not the reader or the power supply. Sometimes my computer will knock the reader off when I insert the card and I have to unplug and replug the cord going to my usb2 card. Thanks