Laptop blurred screen is a quite common failure, and there’re many reasons for it, different reasons may cause different failure symptoms, so the solutions are different. And in text, it behaves as disordered characters and tousy pictures!
1. The thermal performance of the main chip of display card is bad
This would also cause blurred screen symptom. Solution: improve the thermal performance of the display card.
2. The running speed of the display card RAM is too low, and the driver is terrible
When display cache speed is too slow, which couldn’t match with the speed of the machine, then this symptom would happen. Solution: replace display cache with higher speed, or to lower the speed of the machine. Upgrade the display card driver.
3.  Display card memory is broken
After display card memory is broken, when system starts up, blurred screen and disordered characters would occur. Solution: it’s obliged to replace the display card. Notice: some display cards are integrated on motherboard, then you have to change display card chip too.
4. Signal cable connection is bad
Bad connection between motherboard/high-voltage inverter and display signal cable would also cause the problem. When the machine is off, you may pull and plug and plug the signal cable plug again, and check up carefully whether the pins are bended or distorted. Replace a good signal cable and have a try!