XP Home. Desktop. User, 2 days ago, had new monitor installed and a new video card. Since then cannot not print to USB Printer(lexmark x73). Tried other USB devices (external HD and flash drive) in all 4 ports (2 in back and 2 in front)....nothing was detected. Also when browse the CD-ROM drive, nothing shows up (coincidence?). It seems like it is not reading. Device Manager says CD-ROM drive working properly. Maybe there was EMI damage when new video card was installed. Previous tech opened up computer on carpet on a very cool dry day. Any ideas?