From what you describe, I surmise:

Smell was from processor burning. Processor was inserted incorrectly.
Processor may still be usable.

Mobo maybe damaged, but I would go through normal no start procedures
before giving up on mobo. Your "wouldn't start either" doesn't give
details. If overdrive processor was inserted incorrectly, was Celeron
inserted correctly when replaced, cut off corner match cut off corner?

It appears you "got hold of" an overdrive processor without instructions.
Mary Wolden posted considerations to check upgrading a processor.
Instructions were probably available at Intel's website.

Demetri Kolokotronis

On Mon, 14 May 2001 16:13:09 -0500 John Murray <[log in to unmask]>
writes:
> Hi Folks, hope someone can help me. I am living proof that a little
> knowledge is dangerous. I got hold of an Intel Pentium Overdive
> (that's what it says on the sticker attached to the on-board fan)
> and I thought I would try swapping it for the CyrixInstead processor
> I am currently using. No joy there though, as the computer wouldn't
> boot so I swapped them back and everything's hunky-dory. A friend of
> mine is having trouble with a noisy processor fan in his tower
> system and I thought that this spare processor might be swapped for
> his Intel Celeron processor thus maybe solving his noise problem,
> but if performance suffered we would swap back. Now, there must have
> been something I didn't consider before rashly charging ahead
> because the Pentium processor didn't even start. Instead, I noticed
> a slight electronic burning smell that I didn't like at all! When
> the original Celeron processor was returned it wouldn't start
> either. I would be grateful if someone could help me get my mates
> computer going again and restore my good name. Thank you John
> Murray
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