Nevermind, it's now stopped booting altogether.

I've first tried Hans' recommended fix (moving L5) but that didn't work, then snapped one leg of L5 without having a spare one. After much cursing I hoped G3JRH's fix could save the day (I have a small supply of Schottky diodes), but no.

Either my QCX is haunted or my solder is ageing causing issues around the circuits. I really can't think of other plausible reasons for these behaviour and I'm starting to think it'll be far easier for me to assemble a new QCX than troubleshooting this one.
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73 de Andrea IZ1IVA - cq at iz1iva . net - http://iz1iva.net