Hi Patty Stuart,
My name is Rohan and I work for Dell.
Please follow the below link and find the manual for the Dimension 3100.
http://dell.to/1BLjvmf
This will help you in finding the right way to open the cabinet to remove the hard drive.
-Rohan
Social Media and Community Professional
Order Status: http://dell.to/1fgKSTr
Download Drivers : http://dell.to/1hcxG98
Link below may be of assistance
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