Acer Aspire screen went black but the laptop seems on

Plug it into a TV or monitor with HDMI. If the picture shows up there, the laptop is fine and it's the screen or its cable. If nothing shows there either, it's more likely stuck. For stuck: unplug the charger and hold power for a good 30 seconds. A lot of Aspires also have a tiny pinhole on the bottom for a battery reset, hold a paperclip in it for a few seconds with the charger out. Then try Win+Ctrl+Shift+B, which restarts the graphics driver. One more check: shine a torch at the screen at an angle. If you can faintly see the desktop, the backlight has died, that's a repair job.