Another issue I neglected to mention - sometimes the ADB won't work. For the record, the capacitors are "Quino"...never heard of them before - I'm guessing they might be a no-name brand? They're electrolytics. Capacitor C7 actually fell off the night I got the board...I managed to reattach that with my dreadful soldering skills, however one of the pins has come detached. The Mac still boots though

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No-name brand capacitors are no good. Using electrolyte or tantalum one's for recapping is a personal choice, however when they fall off there's no doubt that the job is not well done.

I suggest you immediately stop using the board and send it to someone to recap properly ( like Uniserver ) before you damage it beyond repair.

The problem with the ADB port can be related to the capacitors as it needs the +5v line or the ADB socket can have loose contacts.