I think I mentioned it last year, but about a year ago, I got a Lombard/333MHz for about £6.50 on ebay.

Unfortunately, it sometimes crashes and won't normally boot unless it has been unplugged for a while, or if I boot into Open Firmware and type 'mac-boot'.

Sometimes, this error appeared on booting:

http://a.imageshack.us/img141/434/cache.jpg

This hasn't come up for a while, and it hasn't crashed for a while (but the boot problems still occur). Today I ran Gauge Pro and it says that the 512k of L2 cache is disabled.

Any ideas? I have tried just about every combination of PRAM resets, NVRAM resets, PMU resets and OF resets as I can think of.

I've just done a little bit of googling, and it appears that the problem could be down to a faulty L2 cache.

Sounds about right. I ran into that problem with a Wallstreet processor module a while back. The cache must have taken a zap from static or something one of the many times I cracked open the machine. Given that it was a 233MHz module with only 512k of cache to begin with, that made it pretty worthless to me. On the bright side, though, Lombards are cheap and plentiful, so you might be able to pick up a 400MHz CPU module for a song if you look around a bit.

Peace,
Drew
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Power to the PowerPC!