why is my dell laptop showing black screen

2:59

5:34

00:56

5:43

1:19

9:26

18:15

1:02

4:11

3:20

4:39

3:12

9:18

1:12

4:00

4:05

9:25

6:55

2:46

3:52

3:04

2:28

6:21

2:10

3:50

4:29

9:39

8:32

1:22

5:16

1:04

6:40

1:40

7:15

7:20

11:52

11:28

2:18

4:42

6:37

4:43

11:44

3:41

12:18

4:58

5:27

4:38

9:50

4:09

11:41

4:05

5:44

9:26

2:35

5:23

6:26

9:04

00:52

5:08

5:41