roy69

How old is your laptop? It sounds like the backlight has blown. This can be repaired at a shop and will cost between 40-50 quid.

Things to try first,

1. Plug your laptop into the mains. Laptop displays are brighter when plugged in.

2. Press FN and the button that turns up the brightness. It may be the 8 or 9 key.

If your laptop is under a year old return it to the shop where bought.