Monitor acer al`511 montor tries to come on then color goes bad light stays on green

my acer al 1711 monitor goes off after three seconds of applying new settings with resolution chgs or refresh rate the monitor display is blank but the light is green.

Check power supply section for bad caps first.
Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply, blown fuses, failed inverter circuits (blown fuse, shorted transistors, shorted/open transformers), bad lamps (poor solder connections or worn out lamps). You will need to open it up and inspect the inside, see example of failed ACER monitors to get some ideas what to look for: http://s807.photobucket.com/home/budm/allalbums
Post back what you see inside so we can guide you further and it will help out other people in the future also.
http://en.wikipedia.org/wiki/Capacitor_plague
http://www.badcaps.net

Replace your monitor power cord

First place to check will be the bad caps with bulgign top in the power supply section, post back what you see inside so we can guid eyou further, see example of failed monitors due to bad caps: http://s807.photobucket.com/home/budm/allalbums

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

Change to new monitor
Vitally

it sounds like a deleted driver? try getting the driver for the monitor, did you loose the Operating system at some point, if so try a system restore to a date when the computer was working properlly prior to the malfunction. It sounds like it restored you to a time before the driver for that monitor was installed.

Monitor is getting hot and cutting off. Try on another computer. Try another video card. If it does the same thing then it is BAD

your asking which part you want to replace. try first to check all the connections.

This is most probably cause by one or more Faulty Electrolytic Capacitors, I find these are the MOST commonest form of "Fault" in these LCD's TFT's units. I ususally simply replace "On Spec" all High Value Electros, in fact ALL Electro's are suspect and often I just "Shotgun" and replace 'em all. Usually fixes all problems. Always use High Temperature Caps. Try this as it is a common problem I find a lot. Good Luck.