Dimension B110 CPU upgrade

I'm a little stumped, I've got a B110, I just bought a SL6WK (3 ghz 800 mhz FSB) CPU to put in it, this would be an upgrade from a 2.53 ghz celeron (533 FSB)

the motherboard is a 0WF887

when I installed the new CPU the computer was brain dead, the old CPU (2.53 ghz celeron) works fine, but the new SL6WK (Northwood) doesn't work at all, the CPU is ok, it workes fine in another one of my computers, but not this B110, which leads me to believe that the B110 mobo just isn't willing to accept that northwood.

I saw the list of dell autherized CPU's for the B110, and the list doesn't show anything with an 800mhz FSB, but looking at the MOBO specs, it says it will take a Celeron D, or an intel pentium 4, (up to 800 mhz FSB)

so what gives here? what am I missing? in my thinking that SL6WK should have worked without question, but it's obvious that the mobo just didn't like it.

my question is, can I run any of the 800mhz FSB CPU's in a B110?