http://www.zoeller.com
More than likely the pump is broken from age possibly.
When you pull the pump, look to see if the impeller is jammed from a foreign object or not.
This might be the cause for its failure.
If so, then you will have to thoroughly clean the pump pit to keep the same situation from reoccurring.
I only use Zoeller products when it comes to sewage ejector pumps; a good sewage ejector pump from them runs about $200.