Laptop screen is not coming after bios error

I was working on my laptop as usual, I don't know what happened exactly, but before that I am facing an issue with bios, because of that my laptop is turning off in the middle of the troubleshooting, the laptop is turning on the Capslock light is turning on and it's blinking, and the power button as well, but the screen is not turning on. Please help me out to resolve this issue.

My Laptop model is Vostro 3400
The troubleshoot method I mentioned is updating the Bios through USB, in the middle of the process the laptop screen went off from then I have been tried 10 times to on, the laptop is turning on but no screen is showing. (There is no issue with Display etc)