This video will show you How to replace a faulty power supply on a Cisco 3560G switch.
Step 1. Remove Side Screws.
Step 2. Remove bracket screws.
Step 3. Remove the screws at the back of the switch.
Step 4. Slide the top of the switch off from the back.
Step 5. Unplug all the power cables from the power supply of the switch.
Step 6. Unscrew the 4 screws either side of the power supply.
Step 7. Slide the power supply out of the switch and replace the power supply as needed.