irrigation well question

Have an irrigation well with 30' depth, 2" pump input and check valve, 1.5hp pump. This setup has delivered great water for the system. Saturday, the pump ran but nothing coming out. Went ahead and primed it, but no output. The guy that dug the well said "well, it's either a bad pump, a bad check valve, or I need to go back and maybe move the plug back down.
Monday, I took the pump to local pump shop. They told me yesterday nothing was wrong. Although I've not heard of a bad check valve, I'm going to change it today.
Any thoughts on where our problems are? Am I missing anything?
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rb wrote:

does it drain out? if it slowly drains back down it is the check valve or a leak in the pipe. if you are in drought conditions maybe the water level has dropped and you need to extend the suction pipe to get it back in the water. can you look in to see where the water level is in relation to the suction pipe. may need flashlite.
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Great thoughts. Thanks.
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