I have only 4 desktop power supply units left that are 300W that have been pulled from working units. All 300W power supplies were tested by connecting the 4-pin, 20-pin, and hard drive connectors to a working PC desktop with motherboard, CPU, CPU fan, and hard drive and turned on for 10 seconds. All 300W power supplies powered the CPU, CPU fan, chassis fans, and hard drive perfectly and had a consistent spinning power supply fan.. Each one is $7 each or take the whole lot for $25. Call or text me at ... serious offers only please.