as an update to this...
I recently got given a box of old computer bits, among these was an old socket 370 celeron - 433mhz.
Now this one is mendocino, not coppermine, so I figured it should work. right?
doesn't work with that one either
I then thought, maybe the board is faulty and can't run fast CPU for some reason (don't know how this would work) so I dropped a slot 1 P3 550 in it - and it came up fine first try
Obviously that theory is down the drain
So then I thought, perhaps the socket370 on the board is faulty - as luck would have it I also got 2 slockets with the bits, so I tested it with both.. Nothing.
Either this board really doesn't like celerons, or something is wrong.
To even further confuse me, I tested the celeron in a separate board, and it worked fine!!