Laptop screen is upside down

[Le Pen]

Hi Peeps,

I've got a Dell (dont laugh) Inspiron thats about 4 months old. It uses WinXP home edition.

Have to say that its been going like a dream. BUT my 10 year old was using it and suddenly, she says, the screen flipped upside down.

So, I turned it off for half an hour and on re-booting the Initial screens, ie the ones with the Dell and XP logos, are the right way up. but when Windows starts and gets to the password bit, the screen is upside down.

Would be pleased to hear any ideas to help wth this.

Thanks

LP