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Unfortunately, this is a standard problem, as when your laptop goes into sleep mode, it shuts off power to the secondary monitor, without giving it the signal to go into sleep mode. You could try digging around your settings, but most likely you'll just need to turn off the monitor when you're not using it.
A flashing green is usually a power supply failure on the main board of the LCD and a protective shut down circuit kicks in when the voltages are not correct at the check sum. This also depending on the circuit configuration that the monitor is in standby mode. Your user manual can give you this information. This also may be the video card itself or a loose cable. Check the monitor cable to see if it is secured. Also check you resolution settings on the PC. This procedure will require you to connect another monitor to the pc to see if it will bring a signal. If a signal is visible then the video card is ok. If not then you will have to check the video driver for the video graphic display card and or replace the card.
Update Bios & Video Driver
Also right click on my computer,go to properties,go under hardware,you can see hardware profiles,delete the dock profile (while the system is off the dock) & then dock & restart
I see many monitor with that trouble.
When you turn on comp., you can have a picture on monitor about 10-30 min. and that go in black screen, or If you change resolution again go in black screen.
You must repair monitor or bay another.
In Windows (since it's a laptop I'll assume you're running Windows XP)
right-click on the desktop, select properties, and go to the settings tab.
Click on the display with the 2 in it, then set the resolution to 1280*1024.
If that doesn't work, you should check wether the desktop is extended to that display, or cloned on it. It should be set to the first.
by the way, in safe mode the resolution is always set to 800*600.
This should fix the problem!
If it doesn't, just post what happened here.
Try Control Panel - Appearance or Display- You can change how your 2nd display looks there.. Sounds like you have it set in Clone mode...(both displays show the same things)...See if you can reset the 2nd display resolution while keeping the laptop in its normal resolution. Not all machines can do this...but most recent ones should be able to.
Have you used the Fn button on your laptop and changed the video display Icon on the Blue Function keys. You need to change the display wait a few seconds for it to take affect. There are several modes try them all so you know how to use them.
This is a communication issue starting with your docking station. Sometimes updated drivers are neede to insure that a device works with all devices between your pc and your laptop. Check on Dells website to see if there is an updated driver. In additon you may want to run the cd that came with your monitor, they are always shipped with a cd with drivers on them!