try this:
at boot press ALT+F10, this will start Acer/windows recovery.
From the Recovery screen
Click on Troubleshoot.
Click on Advanced Options.
Click on Startup Settings.
Click on Restart.
The PC will now reboot to the Startup Settings screen.
Press 4 to Enable Safe Mode as prompted.
once in Safe mode, go to Device manager, click on Display adapters, right click on your VGA and choose uninstall(tick to uninstall software too).
reboot normally and check if black/blank screen is fixed.