Be sure to find the speaker and install it. It usually is a 4-pin connector with two wires (one red, one black, which can be installed either way on the motherboard.
If your case has holes for COM ports and LPT ports, you can punch these out and save a card slot by unscrewing the connectors that came on the slot-filler strip of metal, removing the connector, and mounting it directly on the case.
Attach power cables to the motherboard.
ATX style cases have only one power connector which is keyed to only fit one way
The AT-style power connector comes in two pieces, and must be connected properly. THE BLACK WIRES MUST BE PLACED TOGETHER WHEN PLUGGING THEM INTO THE MOTHERBOARD.
Ensure that the CPU cooling fan is connected to the power supply, this is usually a 4 pin male connector that goes to one of the power supply connectors.
3.10.3 Minimal Peripherals
Floppy disk drive
Mechanical
It may be necessary to re-install the floppy mounting bay, if it was taken out previously.
The floppy drive must protrude from the front of the case, take off one of the 3.5 inch plastic filler panels from the front of the case, then slide the floppy drive in from the front until the front of the drive is flush with the front of the case. Then, using two small screws that are supplied with the case, attach the floppy drives left side, then if the floppy drive bay is detachable, remove the bay with the floppy half installed, and with the drive bay out, install the screws for the right side.
If the drive bay is going to contain hard disks in addition to floppy drives, leave the drive bay out for now and go to the hard disk installation section before putting the drive bay back into the case.
Electrical
The floppy disk needs two connections: one to the power supply, and one to the motherboard or floppy controller. The power supply connector is shaped to prevent you from getting it backwards.
