The agitator became very noisey (clicking sound) and then stopped

Your washing machine top lord or front lord?
If your washing machine top load you have cleared drain valves in have blocked then check drain motor like that as you can check which model or type

It is either the inlet velve or the cycle programmer faulty

Remove the agitator, and turn the transmission pulley, one way, the spin basket will spin, the other way, the transmission spindle should go back and forth. If not, you have a bad transmission.
Here is the transmission to order if you should find it bad.

Here is the upper agitator.
Here is the lower section.

What you need is a motor coupling, either take of front panel if it's on this model or take the whole cabnet off. To do this, take two screws off either side of the back near the timer. Then lift timer console upwards, you'll see two metal clips, get a flat head screw driver pop both and unplug lid switch. Remove cabnet, and the motor coupling is right behind the motor.... It will cost about 29.95 plus tax for the motor coupling give or take

is the agitator seated all the way

whirpool machine .. it was overload and now it's not draining the water. stops when in the drain cycle./

Hello donerehart

You said, water and spin cycles are fine, but won't agitate... what can i do?

Sounds like the timer in the dial will not progress!

Ours did this and it was because the bearings had busted. I called a local repair guy and he told me over the phone just by listening to the sound. Maybe you could do the same. I do know this, if it is your bearings, buy a new washer. It's not worth the repair...trust me.