IMAC won't start up with newly installed 4gb of RAM.

I just bought 2x 2gb (4gb) of RAM for my IMAC 7,1 model and my computer will not start up now.  I have tried the old RAM again and it starts right up.  I assuming it is not compatible, but I don't know why.  They seem to be meeting specs for this system.  It has a max of 4gb, and is a DDR2 SDRAM 667, the RAM I purchased should be compatible according to store manager.  I quested that it was 800 instead of 667 and he said it should be backwards compatible, but for some reason it is not.  Can anyone tell me what the problem might be.  Thanks so much. 
PS please attempt non techy lingo if possible, I am not that knowledgable in the computer world. THANK YOU!!

The specs for your Mac specifically state 667 MHz (see screenshot below) and since iMacs are very finicky about their RAM, it is advised to stay with the exact specs, so, as Kappy said, return it.

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