Why my screen failed to display

HP Pavilion f2105 powers on but nothing appears on the screen, the issue could be related to the display, RAM, or graphics output. First, check if the laptop’s power light and fan turn on. Try connecting the laptop to an external monitor using VGA or HDMI to see if it displays there. If the external monitor works, the laptop screen or display cable may be faulty. Next, reseat the RAM by removing and reinstalling the memory modules. Also try a hard reset by removing the battery, unplugging the charger, holding the power button for 30 seconds, then powering it on again.