Since the pump started again it sure sounds like just dirty contacts for the starter winding. If the contacts are dirty and not making a good contact the motor will hum/buzz and won't start. When the motor is up to speed the contacts open. They are usually located insode the back cover where the power goes in. If you find them just take a little piece of fine sandpaper to them. Another trick, when it won't start, while power is applied and it's buzzing try rapping the case with a short 2x4. Sometimes the shock will cause the contacts to make momentarily.
Check this thread. All pumps are similar. Oh...the speed is going to be either 3450 or 1725 for the 2-speeds. That's fixed by the line frequency and motor design.
http://www.poolforum.com/pf2/showthread.php?t=4800
Al
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