well ,, I'm really confused now ...
I thought he was trying to change the Multi's on the KX7-333, and it locked up.
But now I see reference to a IT7 that's dead also ...
I have never had any mb die on me ...(all had some with problems thou)
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I think he's probably up and running now .. after he cleared CMOS...
The KX7-333 are a hearty mb... I've oc'd the shiznitz outta mine...
I think he's just got some learning to do .....
If your still reading,,, but afraid to reply ....
My KX7-333 had very little thermal paste under the NB HSF unit. (which limited my fsb to 170ish if I remember right)
(yes,,, that means 3dmark2001 and other benchmarks fail,,, among other problems)
If you have some time and some extra cash...
Take out your mb and check under the HSF unit on the nb. (northbridge chip)
Get some Artic Silver thermal adheasive...( permanent glue,,, can only freeze mb to remove) ,,, and a cyrstal orb (I lapped it also)
(cheapest solution)
Or... get a cooper HSF unit that snaps/ bolts on and regular Artic Silver (more expensive usually)
That should improve your oc immensly ( I run 189.9fsb)
As for unlocking your chip ...
There are several methods to unlock chips ... choose your poison,,, some are easy ... some are hard.
Once the chip is manually unlocked ,,, you can change the mulitplier.
(unless you were unlucky enough to buy the new chips that are LOCKED permanently by AMD )
The BIOS only allows multi's 5.5 to 12.5 if I remember correctly
(that's just the way it is... until Abit changes BIOS to allow higher than 12.5)
There's a lot more stuff that can be done... but that's that best advice I can give for now.