Acer Monitor Not Staying On

sounds like failing parts inside the monitor

There's a few things to look for. Maybe you are not getting signal on the cable you are connecting to the monitor... one reason for that would be dedicated graphics card and you are connecting to motherboard graphics. There is always the possibility that the monitor is faulty.

I will assume that you have checked out the power cables and external cables. If this is the case you will usually notice an indicator light from your monitor. Universally it is yellow or orange when it has power, then turns green when it detects input from your computer. If the Led light doesn't turn green even when your laptop is already booted, your culprits would be your iMac's video controller or your monitor's input cables.

That looks like an inverter problem. If the monitor is still under warranty, contact the manufacturer (3 years for both parts and labor if purchased new). Otherwise, open up the back of the monitor and remove the shielding. Look for scorch marks, soot or leaking or bulging capacitors (look like cylinders on tripods). You could just replace the capacitors and the resistor that acted as a fuse. However, for $50-150, depending on the inverter, you can replace the entire part (unplug the wires for the backlight(s) and other connections and swap them).
You can also check the inverter by looking for the high frequency EM put out by the unit. Some high end multimeters will measure this (as will an oscilliscope). Hold the multimeter probes a fraction of an inch apart about an inch above the board (with the multimeter set to read frequency). If the inverter is good (and the frequency is reasonably close to the multimeter's range) you will see either a 1 or a value (kHz). If the inverter is bad or too far out of range, you will see a result near zero.

Once you have the monitor open, record the part number on the board with the damage, including the REV number if any. Search that part online (lcdparts.net and other sites have parts for monitors). Get the correct unit if possible. Some sites sell universal inverters and those can be used. However, you may find the controls reversed (up to lower brightness).

I hope this helps.

Cindy Wells
(a backlight issue would have resulted in a slow fading of the image or the screen looking red/pink.)

Open up the set and look for bad caps, see example of a couple years old monitors that failed.
http://s807.photobucket.com/home/budm/allalbums

I called tech support and it was suggested to send the acer AL2017 monitor back to them to make repairs to the circuit board.

it happened may b due to inproper power supply.So check the monitor data cable & other connections also.

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I just repaired one.... will likely require that you replace 3 X 220 uf 25 volt capactiros and 2 X 1000 uf 25 volt capacitors. can't miss them the tops are swelled up. but the monitor appears to work now... not bad for 5 bucks worth of parts.

have you tried to the "function+8" (or the number to transfer the signal to a monitor) when you are on the laptop with grey screen?
Did you said that grey, means that there is light on the laptop, but no colors, or that tha screen is not turned on?