I confirm if there were a problem with the USB ports, no USB device will be recognized. Hence, based on the number of tests done by you so far, I'd recommend the following, just to make sure:
1. See to it there are no conflicts in Device Manager, especially on the Universal Serial Bus Controllers.
2. Test on all of the USB ports (back and front).
3. Test with another power supply. See the following URL:
Note: "For a system consisting of a supported 65 W processor, 1 GB DDR2 RAM, one hard disk drive, one optical drive, and all board peripherals enabled, the minimum recommended power supply is 300 W." (qtd. on page 56 of the Technical Product Specification)
Well, I always get the message:
I know it's in spanish, but basically it says that one of the usb devices did not work properly and windows was not able to work with it, but the image is not so descriptive, so I don't know which is the one that is not working. could it be that the problem? thanks
Well, I tried again every usb device individually, and I noticed that the usb device that was being recognized as an unknow device all the time was an external dvd burner iomega, everytime I had it connected Windows was talking a long time to perform almost all the actions and I was never able to shut it down except by pressing the turn onf/off button on the case, I tried it on my sister's computer, with windows XP and the computer was taking like 1 - 1 min and half to load everything, right now the computer is working fine without it, it's weird because it was working fine before.........the burner has like 2 years now, and it was giving me problems burning dvd's lately, so maybe that's the reason, anyway, the computer is working excellent now thanks!