Falkryn, Thanks for the suggestions.
I've tried the safe mode procedure as you suggested byt no joy there.
R eyour suggestion of the battery removal, I can't get it out. Maybe Gadget can advise me as my model Dell is known to her. Gadget, if I lay the laptop flat on its front on the table so I can read`"Studio XPS" the correct way up, to remove the battery should the slide be to the left or right of those words above it? Do I then just pull gently?
Thanks,
charlotte