Hello my laptop does not display om screen

[Davetech]

Can some help me please i have an i core 3 HP laptop, it comes on but does not display anything on the window. I realized that the capsluck flashes for 13 times with the F12 light permanently on and then the laptop goes off and come on again repeatedly. Please i need peoples help to get whats the problem.

Here is the details of the laptop:
HP Core i3
S/N: 5CB1443QJ1
Product: QE284UA#ABA
MODEL: 2000379WM
Regulatory Model: TPN-F102

Please i will be grateful to every suggestion,

My name is,
David