Acer screen will not go away

The monitor might be faulty ....do a monitor self test ...disconnect the datat cable from the monitor and turn it on ....there would be a color code , if the color code is ...
RED....GREEN....BLUE which might appear as RGB or the colors itself......then the monitor is ...if the color code is different then the monitor has to be replaced

on screen says "no signal", both green & red diode light are up :

plug vga cable tightly else check with new vga card

correodemie, Your ACER AL2016 will need to have it's "switch-mode-power-supply/CCFL inverter supply" trouble shooted and repaired. DIY repair cost less than $30. Out of warranty service $35 to $75, more if circuit board replaced. Read my and other techs FIXYA profiles to discover all the options you have for your BLACK screen symptom. Follow the links to other web sites for even more useful info. DO THAT before you do anything else. 12fixlouie

When you switch on both Poota and Monitor, is there visual startup flashes or startup information showing on screen.

Make sure the monitor connect to rear of poota is located and firmly in place and properly screwed in?

There is a symbol of Two monitors on F3 Or F4 button

1. Press Fn key and hold it
2. by holding Fn key press F3 key

Your monitor will start displaying

try checking the cables first.

I found some solutions other posted that didn't come up the first time I looked. I did a reboot and I'm good to go!

Hi...there,
It's turns blue to power safe mode (yellow) it's prevent futher damaged to your monitor. It's seems you got a busted backlight inverter. Need to replaced a new one...Since you only got it for a few months, send it back to Acer for a replacement of a new backlight inverter... Have a nice day!

Seems you are not alone.

Try these suggestions.

Try connecting the wires properly. try changing the VGA cable. i had the same problem my screen goes black some times and pink i changed the VGA cable it was absolutely fine!!!
What is VGA cable
VGA Cables Adapters Converters and Devices C2G

visit a computer mechanic for further trobleshooting