Test with only 2gb of RAM see if it amkes a difference.
If it dosen't disconnect all the harddrives and see if it posts faster
I built so many computers with this board. Core 2 Due processor , 2GB RAM (DDR2 667 MHz or DDR2 800 MHz SDRAM DIMMs),HDD SATA 320 or higher. It works good. Try and you get the maximum performance. I think your problem is in HDD. First you just try with another SATA HDD as OS. If you not satisfied then do this config..