I've DP35DP Media Series, Phisical Memory 2048MB, Porcessor Core 2 Duo E6750 2.66 2cores.
the problem is that the Bios booting time takes 2-3 min. to show the Intel Logo or to let me enter to the Bios !!
after updated the Bios to the latest(update 15/07/2009) it worked well for few days then back to be very slow again.
Bear in mind that the motherboard you have is quite old, which may have a performance loss because of the lifetime, however you can try doing a clear CMOS, which will clean up the data that is stored on the BIOS chip (embedded on the motherboard). Follow the steps below to do the clear CMOS process:
Hopefully the recommended step will resolve your issue.
If you have more questions please let me know.