Summary: I was able to install myself and called for technical support for what I needed to do after they were in place for computer to recognise. I also did safety things not mentioned-unplugged computer, My memory were in a tiered fashion also not mentioned in info page. These points were from my friend who has been in business 30 years doing computer build,repairs. I have to upgrade my internet service tosee if work better.
Summary: Got this for my wife's mid-2010 iMac. The situation was a bit different than the previous reviewer, the factory memory was installed in the bottom slots. After struggling with the clamshell packaging that wouldn't let go of the sticks unless it was shredded to tiny pieces, we installed this new memory in the top slots. This was a bit tricky - the key was to press them in quite hard. Sealed it up, turned it on and it immediately booted fine - no beeping.