When I plug my laptop into the mains it works off it but doesn't charge. It only started doing this last night and I have no idea why.
you've gon dun busted it.
Well it sometimes charges and sometimes doesn't. It a bloody new laptop.
Sounds like it might be a dodgy charger if it only charges occasionally if its new new then email the supplier and ask for a replacement
Hit the charger bit...mine has a big box on it and I have to hit it before it starts working. Somethings dodgy inside it I think. But it works after I've hit it once or twice.