XP2100+ on a KT3V problems!...please help

[Danbo]

I'm trying to upgrade to an MSI KT3V and an XP2100+.
I've got the system built up, but when I power up I
get nothing, no beeps, no posts, nada. The diagnosis
LEDs on the back of the MB indicate that the processor
is either damaged or misinstalled. I'm pretty sure I've
got it installed right, it's a retail with the HSF.

I'm wondering two things:
1) Can you think of anything obvious I might have overlooked?
I do have power, and all the fans spin up and the CD light
blinks, but the processor apparently isn't up nor do I get
anything on the screen.

2) Do you think the problem is really with the CPU or could
it be that the MB has a problem? I've got to have this
system done by Easter for my sister, and I'm reluctant to
RMA a perfectly good CPU if the problem lies in the MB.
Any votes or suggestions.

Thanks for any suggestions.

 

[Danbo]

A little more info. None of my case lights are on, and they're
all connected to the MB. I'm a little confused. The bracket LEDs
for diagnostics are all lit, so they have power, but none of the case
LEDs (power , HDD, etc) are on, so maybe I've got a power problem?

 

[boyRacer]

Take everything off... except for ram and vid card... reset cmos.