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So I had the DDR2 stick in, went to the BIOS settings and "Load(ed) Optimized Defaults". Then eventually shut off the computer to trade in the DDR3 memory instead of the DDR2 memory, yet it still did the same exact thing;
I'm really tempted to try that second method you were talking about; changing the timing using the BIOS. Suppose that I try changing the numbers there, might the motherboard completely not work with either DDRs if I set the numbers wrong?
I have exactly same issue. MB works fine with DDR2 2x2GB. I wanted to bump up the memory and bought ADATA 4GB DDR3 1600 PC3-12800 stick.
Combo boards are picky with ram especially DDR3 which has been far from being standard at the time the board has been released.DIMM of 1.5 Volt DDR3 800/1066/1333*(OC) means the board supports DDR3 800 and 1066 1.5v sticks by default and according to it's controllers specs BUT DDR3 1333 is considered overclocking (* oc) and as usual with overclocking it might work or might not work depending on the individual sample. As these sticks are current sticks and your board is quite old compatibility might not be ideal. Eventually it would work with increased voltage or relaxed timings but as your board won't work with the DDR3 sticks at all you can't change settings.An idea would be clearing cmos before retrying with just one stick as you changed from DDR2 to DDR3 and old settings could be a problem too (>>Clear CMOS Guide<<).