HT3918 I upgraded to 16 mb of ram and after 10 minutes my computer freezes, and ideas?

I upgraded to 16 mb of ram and after 10 minutes my computer freezes, and ideas?  I have an imac mid 2011 21 inch.

Cause and effect points to out-of-spec memory.
Run Apple Hardware Test. Run the extended tests.
  Using Apple Hardware Test
http://support.apple.com/kb/HT1509 
If it fails the memory tests, remove the memory and re-seat it. The sockets are very "tight". Run AHT again.
If it still fails, replace your original memory. If it works, you found the problem. Buy Mac memory from Crucial or OWC / MacSales.

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