Gateway 7210 System Manual page 73

3
Press the locking tab toward the center of the module while carefully
pulling the failed module out of the power supply.
Locking tab
4
Carefully insert the new power supply module into the vacant slot,
pressing firmly to seat the connector at the back.
5
Tighten the thumbscrew to secure the new module in position.
66
Replacing and Adding Internal Devices
Thumbscrew