Upgrading cpu Problems

Hi
I decided a couple of days ago to upgrade my cpu from a 1800xp to a 3000xp+.
My problem
I have installed but pc doesnt seem to boot up or all of a sudden switches off(Tower light reamains lit).
I have tried with different bus speeds,not sure what the multiplier settings should be or the core voltage.
I have flashed the bios and updated it.
One thing I found during some research is that my motherboard may ony support 166(333mhz)fsb, but still I know.This may sound stupid but I still can't figure out if the one I have got is the 333mhz or 400mhz cpu version,
I have tried by looking with the manufacturer code but I seem to get both versions with it,this is a oem version by the way.

Any advice
Or even better what is the proccess I should go through to install it,step by step(configurations),and how can i found out what settings I must have for this cpu.

Any advice well apreciated


System specs
Motherboard : Lan party KT400A
CPU :3000xp+ Barton
DDR NY 512ddr + Generic 256ddr
HDD:40gb Maxtor
O/S XP pro
Graphics C: gforce 3

 

Hello Zorbas Have you check that your motherboard can support the 3000+ processor. If its the KT400a i think it should support the 3000+. When you flashed the bois did you clear the cmos?

djrock