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I have two 2GB sticks of Corsair XMS2 800MHz RAM and if I turn my computer on with both of them plugged in, whether single or dual channel, LEDs come on. fans spin up, etc. so I know everything is getting power but the monitor stays in standby suggesting it isn't receiving a signal. There is no POST or anything else to indicate the computer is running. If I take one out, leaving a stick in the first slot only, it boots and runs just fine. What does this mean? By the way, the motherboard is an MSI K9A2+ Platinum.
I actually have this exact problem, and my ram and mobo are almost identical. However:
I know it's not a bad stick of ram.
All sticks are identical.
I know it's not a bad mobo because I've swapped out this mobo with a different one and the same problem occurs.
So now it's most likely either the processor (it was overheating recently from too much dust causing a system shutdown until I cleaned out the fan... might have damaged it), the psu, or windows vista 64, or some compatibility problem with the components of my computer.