Are you talking about a PATA ribbon?
Because the M5A78L doesnt have connections for a PATA ribbon, Im assuming you are using an old DVD drive that only has a hookup for PATA, instead of SATA. There should be a 4 pin molex connector for power-
And the data cord would need to be a SATA, which you MB should have plenty of open ports for-
Is it your DVD drive that has the PATA hookup? Because if it does, you will need a new DVD drive, as even if it is possible to convert PATA to SATA, it would be dumb to do so.