No water in Bosch WFLI2440GB, please help!!!!?

There is no water going into my Bosch WFLI2440GB/05 washing machine, regardless of which programme I choose. I have cleaned out the water inlet strainers, checked the tap and all seems fine. I can't hear any noise from the water inlet valve (grey box thing attached to the hose near the tap), so I'm guessing this is faulty? If so, can I attempt to fix this myself? No expert in this field, but willing to try!