I wanted to lower down my brightness but suddenly the screen went black / blank. I tried to turn on the brightness but the button doesnt work. I tried various way like pressing the F button and restarting, but nothing comes up. Not even the logonof dell and just blank
I'd suggest you run LCD Built-in Self Test (BIST) to check the screen itself. Please hold down the D key and press the power button. Release them both, and this should begin the BIST test. You should see colored bars appear on the screen, it should ask if you saw them. Select NO to begin the test.
Please run diagnostic tool to check the hardware on the system by following steps below:
1. Power off system
2. Power on system, quickly tap the F12 key continuously until you see Preparing one time boot menu in the top right corner of the screen. In the boot menu, stroll down to Diagnostic and then click it. After quick tests, click on hard drive and then Thorough Test Mode. Do same for Memory. Report back any error code.
Anyway possible you could connect a external monitor to laptop? If external monitor show display, then issue could be with laptop LCD screen.