What is the problem if your pump will not pump water from your well?

There are a number of problems that might cause a well not to produce water. There could be some kind of electrical problem and the pump might not be powered up. Or the motor for the pump may have failed. The pump may have lost its prime and cannot pump water (depending on the type of pump), and the water table might have become lower and the pump is now above it and dry. Think about how the pump worked before, and how it works now, and then compare the two "observations" to see if there are any differences. Does the pump sound like it comes on? Open a tap and, while listening at the tap, have someone turn on the pump. Troubleshoot this and return with a more specific question if you can.