What dype do you have. I also own a HP. It's the 3200C. It also has a power supply problem. Probably you MAY need to replace the poser supply. OR try this trick. Go to the Hewlett Packard Website and resoenload a patch for the powersupply. If that does not work try this. But hear me out it really works. " Unplug the scanner wait 30 seconds and plut it back in. Do this about 10 times and that should do it." Check your cable connections also. Finally let me know if you own a 3200C and if you want me to resend you the driver. By the way reloading the scanner software doew NOT seem to work. Bsteph