To fix the computer monitor no signal detected the issue, you will need first to check which component is the cause of this issue.

On the contrary, if you see no image on the second monitor too then most probably your laptop is defective.

Now if you see an image on the second monitor, there is an issue with your Laptop LCD.

This switches the display to the second monitor.

When the LED lights of the laptop turn on, press the “Fn” key.

Connect the power chord and switch in the laptop.

Connect this spare monitor to the laptop.

Get a monitor cable and a spare monitor.

Using Spare Monitor For a Laptop Booting to a Black Screen Now check if the display is fine or not.ģ. Connect the power chord to the laptop and turn it on.Do the same for the hard drive, i.e., locate it, find the hard drive cover, remove the hard drive, and reinsert it.Push it down so that it gets perfectly snapped in its place.Afterward, unlock the memory module clips and remove it from its slot.When you find the memory cover, remove its screws with a screwdriver.Most laptops have a small memory stick icon on the memory slot cover.Then flip it over in an upside down position.

Unplug the AC adapter from the laptop, shut it down and close the LCD screen.

Laptop screen not turning on