i tried change the fsb in the bios but every time i do it, and come out of the bios, i computer screen goes blank, and stops working, and to get it working again i have to pull the bios battery and reset the bios
just for a faster bios cleaing, there should be a jumper ner the abttery that when u flip it, it clears the bios and u dont have to wait for the battery current to run out of the board, also have you tried other multipliers 133, 200 266?
My dad's MSI KT3V is kind of weird in the way you set CPU speed in the BIOS. Once you highlight the desired setting you need to press "enter" again to lock it in. I spent a few grim moments thinking I had some bad hardware when I first set it up.
Just a thought, are you sure you're actually locking in the settings you pick?
another thing, make sure you have the latest bios for tha board. i had the same situation with my asus a7n8x when i upgraded to the latest bios and funny enough the only way to get my memory to run at 133 was to downgrade to an earlier bios. with the latest bios, my 2400+ would always boot up as an 1800+
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Just a thought, are you sure you're actually locking in the settings you pick?
An XP2400 runs at 2Ghz, I believe, so at 133 multiplier would be 15.
Might be worth checking, just a thought.
Anyway, as the others already said, make sure you are using 133MHz capable RAM with a multiplier of 15.