My 3.5" floppy stopped reading disks. I checked the disks and they are good, they are read fine on another computer. I checked the BIOS and its fine. The ribbon and power cord are connected correctly and securely. I've even replaced the drvie with a new drive. And still it won't read the disks. The drive is recognized and there are no IRQ conflicts. Could it be the ribbon? Or is there something else more obviouse that I'm missing?? HELP ME.