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Stephen,
Did you try looking at an object at larger distance. Many telescopes are designed to focus objects like stars at infinity. When objects are too close, you may run out of focuser adjustment and hence can't focus the object. Did you try focussing your lowest power eyepiece by holding it further out above the diagonal mirror insert tube. In fact, did you have the diagonal mirror in the focuser, otherwise you are shortening your distance to focus? It could also be a problem with the diagonal mirror. Have the coatings on the mirror degraded or do they look fine? If it is a flat mirror, the mirror may have been knocked off angle. Check if it is seated properly.
Regards, Rob
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