Black screen with blinking cursor on my Dell Laptop

Hi am looking for someone who can help me fix my computer problem, that has been making me too frustrated for the past two days.
For the same problem I have called Dell. But since my computer's warranty has expired, they said I need to pay for the troubleshooting. So I am here, looking out for help from someone who could help me to fix this.
The problem is, when I turn on the computer, I see a black screen with a blinking cursor. It never takes me to the Main screen. I have no idea on what appended to my computer. I would be very thankful, if you could help me fix the problem. It’s a Dell Inspiron laptop.
