Hi chauchylongboat,
The Heat Sink and Fan Assembly on this system is installed using three screws only. Here are the pictures showing its dis-assembly:
You may refer to the link for http://bit.ly/12jN7Vb service manual of this system for detailed steps on replacing the hardware components.
Note: Please follow the safety instructions, before you replace any hardware component.
Please run the diagnostics on the system to confirm hardware functionality. Here are the steps:
- Restart the system and immediately start tapping the 'F12' key to enter the 'Boot Menu'.
- Use the 'Down Arrow' key to highlight the 'Diagnostics' option. Press the 'Enter' key.
- The diagnostics will begin. Please note the exact error message/code, if any appears on the screen.
Also, follow the steps listed on the link http://dell.to/Y7RuOY for troubleshooting the fan noise issue.
Please share the results.