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😄 Oh, yes, it's spelt 'Osborne'! That does give away my anglo heritage. But I live in New Zealand. Trust me, TEMU is global, saturated global. I hear mixed reviews.

Yes, I have seen de-soldering guns used on YouTube. While I don't, myself, have much experience or gear, I have friends and colleagues who have up to professional experience and gear. So together with them I have hope we can do it! 😄

Thank you all. I think the broken CPU pin and bad fix up is the explanation that matches all the evidence. I agree the best fix is to replace the socket and the Z80. I will heed the advice in progressing that. Thank you. It also occurred to me, that for debugging purposes, I could remove this...

I have measured the power supply DC voltages. It is giving a steady 12.42V and 5.17V.

Could it just be solder flux residue?

That is a very insightful point, Ruud. Thank you. There are no burned out traces around the Z80, or the reset switch. What then explains the messy orange material around the socket?

I have an Osbourne 1 that I am trying to restore. It's round two. I first looked at it in 2009. A capacitor in the power supply went pop, so I replaced the three similar ones on the power supply. Once that was done the PC started to work seemingly well for a few days. But then it suddenly...