Power management is most beneficial for laptops and is near useless for PCs.
The Epson Stylus Color 740 USB printer is printing as it should. I've really got to get more sleep. Look in Hardware Resources, IRQs. I have the Epson Stylus 740 attached via USB to a PC operating Win 98. It has been operating fine until a disk crash required it to be re-installed to a newly formatted drive C and fresh Windows installation.