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I don’t have the manual anymore for this computer, but we went with a new pc and I need to make sure our banking data, etc. is gone for good on this old Mac. I unscrewed a plate at the bottom of the unit that had 3 screws in it and all I can see is 2 thin plastic tabs that can be pulled out, but when you pull on them, nothing is moving. Can this be done? I don’t see anywhere else on the body of this where I can open anything. Thanks for any help.

You have a: Apple iMac “Core 2 Duo” 3.06 21.5-Inch (Late 2009) Specs Identifiers: Late 2009 - MB950LL/A* - iMac10,1 - A1311 -  2308 Here’s how to do it on your model: iMac Intel 21.5" EMC 2308 Hard Drive Replacement

Hello There is not a phical hard drive in this model There is a Solid-state drive (SSD) Hope this link will help iMac Pro Teardown