2. Test your Seasonic PSU before installation
2.6. Turn on the power supply by setting
the I/O switch to the "I" (ON) position.
If the power supply fan starts spinning
(or the externally attached LED light
turns on), then your PSU is working.
The drawings illustrate a fully modular PSU with a fan control switch and a Power Supply Tester; the features and
accessories of your PSU might be di erent.
10-pin Connector
18-pin Connector
2.1. Plug the AC power cord into the PSU.
Make sure that the AC power is coming
directly from the wall outlet.
It is recommended to use a high quality surge
protector to protect the PSU and the system.
2.2. Connect both the 18-pin and 10-pin
connectors of the motherboard cable to
the PSU.
2.3. If your power supply features a fan
control switch, set it to "Normal" Mode*.
* In Hybrid or Fanless Mode (S FC) the fan will not turn.
2.4. If you have a Power Supply
Tester**, attach it to the 24-pin
motherboard connector. There
is a notch on the Tester that
helps to make a perfect fit with
the 24-pin connector.
** If you do not have a power supply
tester, refer to the paper clip method
described below.
2.5. (Optional) For testing a Fanless PSU
or a PSU without the fan control switch,
attach an external fan or LED light using
a Molex cable to the PSU.
Paper clip method
Power Supply Tester
Use a paper clip or a
piece of wire to create
a short circuit on the
24-pin motherboard
connector by
connecting the pins
shown on the
illustration.