Remove the floppy drive cable from the motherboard. It may be necessary to lift up the edge of the motherboard to make it easier to remove the connector.

Remove the speaker cable from the motherboard.

Remove the LED cable from the motherboard.

Make sure to pull only on the connector, and not the wires, or you will risk damage to the connection.

If you have a CD-ROM drive installed in the Mac, remove the CD-ROM audio cable from the motherboard.