All on the front of the computer tower. Message is: 'put in disk, floppy or usb stick', its not reading that there are disks etc allready in. The back of the tower has a 2 usb ports that work. Q: 3 different drives don't work which lead me to believe its not the individual drives that are fried but the place that they all connect too. what do i check? what do i look for? is there one loose wire that i should be looking for? thanks. i have windows XP.