Late 2007 2.4Ghz iMac wont boot - no chime or screen

I have a late 2007 2.4Ghz iMac 4GB RAM.  I removed the RAM to take to work, and while I was gone my son came home from School and attempted to boot the machine with no RAM in it.  He rang me up saying the iMac is beeping on startup.  I came home unplugged the iMac from the power and put the RAM back in.  I tried to boot and I can hear the fans spin up for a second and then nothing.  No chime, no screen. 
I tried using other RAM and swapping them out - nothing.  I tried unplugging for 15 seconds etc, but I'm not getting anywhere.  Any ideas?

It took me a while but I found out the culprit was using 800Mhz DDR2 RAM rather than the stock 667Mhz.  800Mhz RAM I've used in other 667MHz machines and assumed it was backward compatible.  Seems an issue with this particular 2007 iMac?

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