The only thing I can think of is to make sure the BIOS is defaulting to the DDR333 speed and timing. Get CPU-Z 1.44.2. Install the 333 stick and run CPU-Z. Check the SPD tab and write down the values. Manually set the BIOS to those parameters. Add the 400 stick and try booting.
This shouldn't be the problem, because the mobo should default to the slowest speed RAM, but maybe it didn't.
I tried setting the bios to default to 333,but eve n that did not work.
In cpu-z ,my samsung ddr ram shows Dram frequency of 176.9 (353.8 Mhz) even when I set the frequency to 333 in the bios. I guess my other ram is not able to achieve the same frequency.
Any other solution. ??
You don't set the frequency to 333 you set it to 166. because you are setting the base frequency of the clock generator. DDR is rated at double. 333/2 =~166. Maybe you should just pick up another stick of DDR 400.
At least most mobos are that way, check your manual.