Is it truly not dispensing or is it just full of water after a cycle? The machine floods that compartment and it them siphons the mix out to empty it. If it is 100% undiluted detergent proceed as follows.
Try to start a cold wash or rinse and spin to verify incoming cold water. If that is ok...
Put it in test mode:
Press spin speed, soil level and power at the same time. If you get it all lights will come on and the door will lock.
Pressing start will advance the test. The first 3 tests are motor, the following are valves, each press of start will open a valve.. If any do not open that's your issue. After valves is tumble (on some), heater (if you have one), then drain then exit.
If there is no or very little cold entering, turn the water off at the wall and remove hose from back of the machine, you may find a clogged screen in the plastic valve, where the hose attaches.