Hi,
Please do try these troubleshooting steps that may help in solving the issue.
- Do a hard reboot, remove the battery and unplug the AC adapter then press and hold the power button for 20 seconds then try booting it up again.
- If it will still load into a black screen, try connecting an external monitor and see if you'll get any display from it. If there's still not display on the external display that could only mean that the problem is the motherboard.
- But if you'll get a display on the external monitor that could mean that the problem is the built in display. Try to open the laptop and check the ribbon cable that connects the LCD to the motherboard if it's seated properly. Disconnect both ends of the cable then plug it back in just to make sure everything is seated properly and if it will still not work you'll need to replace the screen.
- If there's still no display on the external monitor proceed with reseating the RAM's, remove them all for couple of seconds then put them back in making sure everything is seated properly.
- If all these will not work the problem is the motherboard. If the laptop is still under the factory warranty do contact ACER for a repair.