Warning beeps after RAM upgrade install -- help!

I am upgrading my mac mini RAM from 2 to 8GB.
When I installed Crucial 8GB kit (4GBx2) and turn the mac mini on I get a repeating 3 beeps...What's up?

I put an 8GB > Crucial kit in my 2010 Mac Mini a couple of years ago.
To expand on stedman1's first question.
As you installed each new module, did you push it firmly into the slot and then swing it down into the clips?
see > Mac mini: How to remove or install memory

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    Welcome to the Apple discussions.
    We could discuss how you'd benefit from the additional memory, however, since the system isn't working, let's focus on the beeps.
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    Message was edited by: finn bell

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