Is anyone else having issues with it just saying javascript is disaabled?

tried on several pcs in 2 schools other tests show javascript is on for instance iATN - How to Enable JavaScript in Your Browser. ive gone through group policy added it to trusted sites set trusted sites to low security changed settings manually and as far as i can tell it should work. Ive just deployed firefox on a pc(wasnt thinking and deployed uk version rather than en-gb first time but oh well) and the javascript box is definately ticked but still wont load. Best of it is in the school i as in yesterday 2 indetical laptops one worked one diddnt any ideas as im stumped