My Bosch dishwasher fills with water but when it comes to the wash cycle it does nothing.

If the dishwasher is not starting the wash cycle after replacing the circulating pump, it is possible that there is an issue with the control board. You may want to check the wiring connections between the control board and the new pump to make sure they are properly connected. If the connections are correct, you may need to test the control board and its various circuits to see if there is an issue with any of the components. It is also possible that there is a problem with a sensor or switch that is preventing the dishwasher from starting the wash cycle. You may need to consult the dishwasher's user manual or contact Bosch customer support for further assistance.

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This may sound odd but might work.

Reset the machine as to start a new cycle. Add 2-4 cups of water. If the machine starts and runs through a cycle then the water inlet valve needs to be replaced.

Good luck

What noise does it make?

Here is an excerpt from "Bosch Dishwasher Troublesoooting".

Running a Test Cycle
Bosch dishwashers have a test cycle which can be run as a troubleshooting measure. The method to run this test cycle is similar across the Bosch dishwasher range so if your dishwasher features seems different from those described below then try experimenting, as the process is fairly straight forward and will be very similar. Bosch dishwasher model numbers are usually found around the top or lip of the door. One of the most common differences between dishwasher models is simply the names of the buttons. For example in the first example below, POWER SCRUB PLUS and REGULAR WASH may be called WASH and ECO depending on your dishwasher model and the country you are in. The other key difference is whether your dishwasher has a display panel (which can display error codes) or not (in which case a program light will illuminate to tell you the fault.
To run the test cycle hold down the POWER SCRUB PLUS and REGULAR WASH buttons. Whilst held down press the ON/OFF button. The lights above them should flash. Now you can check the status of each dishwasher program by pressing its button. Now you can run the full test cycle = Press the POWER SCRUB PLUS and REGULAR WASH buttons again. The dishwasher will start up and when the cycle has ended one, if you have no display panel on your dishwasher model the indicator lights will illuminate if a malfunction was detected as follows -
CLEAN - A temperature sensor fault. If this is the case then the test cycle will be very short as the dishwasher will terminate the test once it's been detected.
RINSE/DRY - A water sensor/filling fault. If this is the problem then the test cycle will not complete as the dishwasher cannot detect the right level of water, the dishwasher will just keep filling and draining again.
WASH - A heating fault. Check your heating element.
If you do have a display panel on your Bosch dishwasher then after the cycle is complete an error code will be shown if a fault has been detected. The error codes are as follows -
0 - No errors have been detected.
1 - A water sensor/filling fault.
2 - A heating fault.
4 - A water filling fault. This can also appear as F on the display during a normal cycle.
8 - A temperature sensor fault.
When troubleshooting your Bosch dishwasher, running the above test cycle is a good start in diagnosing the problem and should give you an idea of where the problem lies with your Bosch dishwasher and what fixes and repair are in order. Our general troubleshooting page will give you some ideas on other things to check on your dishwasher. Good luck!

If it's brand new, working on it yourself may void your warranty.

Sounds like you need a new water inlet valve. It's not shutting off completely, so water slowly enters the machine even while it isn't running.

was the safty tab on the inside of the units water receiver removed?

Replace the water fill valve, it's leaking.

hi there your dishwasher has gone into flood protection mode ie. water has leaked into the base and activated the float switch.

to try and locate the leak tip your d/w back to drain the water from the base then remove both side panels and start a program to see if you can see where the water is leaking from, being careful not to touch anything while the d/w is running as live parts are exposed

hope this is of some help