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Neil,
With the Meade 14", something else to check is that the mirror lock knob is turned to the 'unlocked' position. If it's in the 'locked' position, focusing is not possible via the normal means, unless the mechanism is broken (by say, forcing it.)
I assume that the original focusing mechanism hasn't been replaced with a Crayford-style focuser? If it has been replaced, it's possible that true focus is out of range. If this is the case, then set the Crayford-style focuser at about mid-range, then unlock the mirror and use the original focuser to bring the scope to focus (as viewed through the eye piece), then lock the mirror and use the Crayford-style focuser for subsequent focusing.
Once again, some help from a local astronomer would be highly recommended.
Good luck!
Chris
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