Posted 19 March 2007 - 08:38 PM
My computer is a Dell Dimension 8300 bought in 2003 with one GB memory. OS = Windows XP Home Edition. The computer has 8 USB ports, 6 in back, 2 in front. I normally have a backup hard drive, two printers, and the optical mouse connected to the back and a media card reader connected to the front.
Until a few days ago everything was fine. Then at startup I got an unrecognized USB device notice. It was one of the printers (an HP 1018 LaserJet). I disconnected the backup drive and connected the printer to that cable. The printer was then recognized. I connected the backup hard drive via the printer cable and the hard drive was not recognized. I was careful to power off the devices while cable swapping. I concluded the problem was the cable and bought a new one.
This worked only for awhile. Bottom line now is that I can switch cables and the ports to which devices are connected and get random results. A device can be recognized and the computer restarted and the device won't be recognized. Right now as I type this only two devices are recognized: the mouse and one of the printers. And the printer is now connected via one of the front side ports as I could not get it to be recognized when connected to any of the backside ports. As described above, the printer is normally connected to a backside port.
I have also tried all sorts of combinations of PC power on/off and device power on/off. The only reliable connection has been the optical mouse - the mouse (cursor) has not yet given me any trouble and I have never had to try to move its connection or change the cable.
What do you think is the problem here?