has anybody have alber e fix 15 ?

hi l have a Alber e fix 15 l have a problem with it at the moment. l am not sure what the problem is there is no power on the screen at all .when l press the joystick on button l can hear the clicking noise but no power comes on.l put new batteries still the same.the electrician looked at the unit he suggusted maybe problem with the joystick. wheel hubs have got a less chance of problem.there is no problem with the battery. before we fork out big money any chance we could try our joystick or wheels on your chair. to isolate what the problem is.or if anyone knows someone who has Alber E fix 15 would appreciate any help. l cant mobilize please help. l hope l will get good news soon. please respond or private message me. thanks