My iMac freezes and then I get three beeps three constant beeps

This problem has gone on for a long time, I'm under the impression that it could possibly be the ram that I added to the machine but I don't believe that's the problem.
This crash occurs maybe 4 times a day I leave my machine on constantly is this a familiar problem, is it mechanical or is it software

Welcome to the Apple Support Communities
That means that your RAM hasn't passed the integrity check, so your computer can't start with that memory. Just remove the memory you added and install the original memory that came with the Mac, and if you can, return the added memory, because it looks like you didn't buy the correct memory for the computer, or your memory is damaged. See > http://support.apple.com/kb/HT2538
If you want more memory, I recommend you to buy it in OWC or Crucial, that guarantees the maximum compatibility with your iMac, so you won't have problems like this

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