Why is one of my ram bank not working on my iMac?

I have an iMac purchased in 2008 equipped with one Hynix 1GB PC2-6400-ddr2-800MHZ ram. I have two ram banks. I wanted to upgrade the ram and purchased 2 Crucial DDR2 PC2-6400 800MHZ ram bars. When I insert one of the Crucial bar in the ram bank occupied by the old ram, it works. But when I insert the second Crucial bar in the second bank, I hear the usual starting chime, but then it doesn't go any further and the screen stays black. I tried and re-tried to insert the bar, but always get the same problem. Any idea what causes the problem?

Try with one crucial module and your original Hynix module. Does it start? Swap Crucial modules and try again. If it starts with one module and not the other you got a bad module from Crucial. If that's the case they have a lifetime warranty and great customer service.
If after trying different combinations in different slots you isolate it to a bad ram slot then you're looking at a bigger problem. Believe it or not ram slots can fail, even if they've never been used. The heat inside an iMac alone could cause solder joints to fail and render a slot useless.

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