Can anyone help with my broken electric boiler?????

If the power on light is out then I would think the fuse is the problem, there must be one somewhere in your fuse box. If located and found to be OK then perhaps the neon light has blown, do you have a mate with a electrical test-meter to check the circuit is OK. If circuit and fuse both OK but still no hot water then I would replace the thermostat in the immersion before actually having the water turned off, draining the tank and replacing the complete heater.