Yet another post in the "Hot Topic!" category.

Patrick and I may have identified a main board failure mode that can occur if you incorrectly re-plug your display cable back onto the board header, off-by-one in a specific direction. It is likely that this, not incorrectly plugging IDE cables, could be the cause of the frequent CS4231A sound chip failures.

It is likely that there will be a relatively straightforward retro-fit solution for this, and as soon as we have worked out the details, we'll let you know.

However, the gilded warning message for now is, if you love your sound chip, when plugging your display cable on/off, ensure that the cable is correctly aligned before re-plugging and powering the unit on. The moment of truth is when you power on the unit - by which time, if you didn't get it right - IT'S TOO LATE
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One of the few remaining Mk1 owners... #00015