Antec III 500 User Manual

2

This manual does not cover CPU, RAM, or expansion card installation. Please consult 
your motherboard manual for specific mounting instructions and troubleshooting.
1.

Lay the case down, with the open side facing up. The drive cages and power 
supply should be visible.

2.

Make sure you have the correct I/O panel for your motherboard. If the panel 
provided with the case isn’t suitable, please contact your motherboard 
manufacturer for the correct I/O panel.

3.

Line up your motherboard with the standoff holes, and remember which holes 
are lined up. Not all motherboards will match with all the provided holes; this 
is normal, and won’t affect functionally. (In other words, there will likely be 
extra holes.)

4.    Remove your motherboard by lifting it up.
5.

Screw the brass standoffs into the threaded holes that line up with your 
motherboard. Do not over-tighten the standoffs. Some standoffs may be 
pre-installed for your convenience.

6.    Place your motherboard on the brass standoffs.
7.

Screw in your motherboard to the standoffs with the provided Philips-head 
screws. Your motherboard is now installed.

If the motherboard has a 20-pin power receptacle, detach the 4-pin attachment on 
the 24-pin power connector, see pictures 1 and 2. Before you connect the power 
supply to any of the devices, please consult the appropriate user manuals for the 
motherboard and other peripherals. 
1.

Connect the 24-pin Main Power Connector and 
the 4-pin or 8-pin 12V connector to the motherboard 
as needed. If the motherboard uses a 20-pin 
connector, detach the 4-pin attachment on the 
24-pin power connector (see pictures 1 and 2). 

Note: the detachable 4-pin section cannot be 
used in place of a 4-pin +12V connector.

2.

Connect the Reset switch (labeled RESET SW) to 
the motherboard at the RST connector. Polarity (positive and negative) does 
not matter for switches.

3.

The Power Switch (labeled POWER SW) connects to the PWR connector on 
the motherboard.

4.

The Power LED (labeled POWER LED) connector is located behind the Reset 
connector. For LEDs, colored wires are positive (+). White or black wires are 
negative (–). If the LED does not light up when the system is powered on, try 
reversing the connection. For more info on connecting LEDs to your motherboard, 
see your motherboard manual.

5.

The Hard Drive LED (labeled HDD LED) connects to the hard drive activity header.

You will find a single 10-pin connector on a cable attached to the front USB ports. 
This is an Intel standard connector that is keyed so that it can’t be accidentally 
reversed when connected to a proper Intel® standard motherboard header. Connect 
the 10-pin connector to your motherboard headers so that the blocked pin fits over 
the missing header pin. 

Picture 1

Picture 2

For 24-pin

motherboards

For 20-pin

motherboards