Imac I3 hangs, 3 long beeps, pause, 3 long beeps, etc - requires hard restart to clear

Recently added two 2-Gig memory sticks (now 4 of them).  One of the adds does not show mfr or serial number, but does show "OK"
No other changes, but beeps don't stop until reboot.

I think yoy still hve some bad RAM.
The Memory test can really only be trusted if it finds a problem, not if it doesn't find a problem.
Memtest OS X...
http://www.memtestosx.org/joomla/index.php
Rember is a freeware GUI for the memtest ...
http://tech.kateva.org/2005/10/rember-freeware-memory-test-utility.html

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