I have the Gigabyte X58A UD7 rev 1. A couple of months ago I decided to upgrade my processor (i930) with a i980 leaving everything else unchanged. After the necessary bios upgrade (from the official website)

the sistem doesn't find all the ram (24 GB in 6x4GB). I had tried the modified bios without luck. If I use the first to slot (0 and 1) even alone the system doesn't boot at all. Also, now the boot is very slow... What can I do? :-(