The symptom points to bad ram or bad board.
But I have this other laptop that loads a black screen. Then again I configured windows to use the external display. Be sure you didn't do that or use the Fn keys either. Sorry but I leave it to you to read the manual on Fn key use.
I have a Aspire 1640Z laptop, which I've been having problems with the first day I got it. I changed the motherboard first then came the Hard drive.
This time, I get three beeps at startup, and black screen.
Windows seems to load normaly since I can hear the windows welcoming theme sound.
Curiously I've figured a way to fix it but not permanently.
If I reboot the laptop using the on/off button, same thing bklack screen again.
but if I manage to use the start menu and restart the computer with the black screen using the keyboard the screen is back on.
Do you know what might be the prob? Thank you for your time