Monitor not working after installing new memory in Mac Pro

I installed 4GB of new memory in my first generation Mac Pro following diagram. When I booted the monitor is black. The key board is working but not the monitor. I removed the new memory and tried again but same problem. Any suggestions on solving this problem would be greatly appreciated.

Well no one really buys from Apple and higher density goes into A1:2 then B1:2 and four DIMMs in those is best symmetrical configuration.
You say you tried xyz but not really very specific to me.
Some users doesn't tell much. However sometimes putting all the 512MB (not 500) on one Riser and the 4GB set on other has worked.
If it doesn't work with just the new RAM alone in A1:2 then it is bad or wrong and needs to go back.
And there have been 3-4 article changes on how to reset SMC. Yours has an SMC button. Leaving unplugged alone is a waste and almost useless. Hitting power button while unplugged was added in 2009.
And it could still be your GPU which is common - 7300 or X1900 or 8800GT... or...

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