[Tattered]

ok here is what it says should be in the advanced bios options

"CPU Multi-Threading*
Allows you to determine whether to enable all cpu cores and multi-threading function when useing an intel cpu that supports multi-threading technology. This feature only works for opertating systems that support multi processor mode

Enabled Enables all cpu cores and multi-threading capability (default)
Disabled Enables only one cpu core

note* This item is only present if you install a cu that supports this feature. for more information about itnel cpu's unique features please visit intels's website"

to me it seems that this being disabled would be a logical reason for the display of only one core as that is the listed effect. somthing thats also interesting is that cpu-z wont display the fsb and ram speed and realtemp and it only read the processor as 1 core (though the name is listed in cpu-z as a core 2 duo e5200