How to use a PS3 controller on PC: Wired or Bluetooth

A step-by-step guide to using the DualShock 3 in Windows via Bluetooth or plain old USB.
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7 Ways to Fix the Steam Not Detecting Controller Gaming Issue

Some users report that Steam doesn’t detect their controllers (even when their PCs do). For example, one such user said this: “For some reason, when I try to use Steam with my controller on Bluetooth ...