Or the wireless card may have simply failed.
I was afraid of that. However I have also tried a dongle which used to work and it doesn't recognise it all now.
I haven't added any memory either.
I have a horrible feeling it's just not going to work whatever I do, I was just hoping I was missing something obvious or someone would have a genius moment and be able to fix it from afar.
It might be worth looking to see if the antenna has somehow become disconnected though. But I've never looked inside a laptop before - I've played with the insides of many desktop PCs but never a laptop! But it can't be that different....... !
Thanks for the suggestion.