I can't believe people missed this!

You have Core 2 Duo, I noticed you have PC3200 (DDR400) RAM - your board requires DDR2 RAM. Minimum DDR2 - 533 to run.

Is it actually PC2 3200 (DDR2) or PC 3200 (DDR)?

If it's DDR then it's totally incompatible, which would explain your problem.