If your laptop is on but the screen is blank, begin by performing a hard reset: turn it off, unplug it, and remove the battery (if possible), then restart. Check brightness levels and try toggling display output using shortcut keys (like Fn + display key). Connect to an external monitor to see if the issue is with the screen or the graphics card. If the external display works, your laptop screen or backlight may be faulty. In such cases, professional servicing or screen replacement is usually required. Know more about fix laptop monitor