This usually indicates a failure of the backlight inverter. If you shine a very bright flashlight on the screen and can see a recognizable pattern like the OS desktop, that is almost certainly the case. If you are handy and it is an ordinary laptop, you can usually get the part on eBay and swap it out yourself.
Fra Angelico was an early Italian Renaissance artist and a monk, considered to be one of the most talented fresco painters of his time. He was born Guido di Pietro in approximately 1395 at Rupecanina in Mugello, but nothing is known of his parents.
He also commissioned the great Brunelleschi to build a church for the Medici family, which was named after San Lorenzo, one of their patron saints. One of Cosimo's greatest gifts to Florence and to the world was the founding of the first public library in Europe, called the Medicea.