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Try changing the vga or dvi cable. This could be a damage cable or a bent, broken pin in the connector.
This could also mean your setup on the monitor is wrong. Try to find the input configuration on the menu and see if it is on "VGA" or "YPBR". If your input is vga and the setting is for "YPBR" than the screen goes to "red" or "pink". Change it back to "VGA".
The worst is you monitor board has defected part.
In that case, sorry mate. You need to go to either a repair shop or buy a new one. :(
Hope this helps
I have a very strong suspicion that you are connecting your Macbook Pro to the VGA input on the monitor instead of the HDMI.
Your Macbook Pro uses the Mini Displayport connection type. Are you using a Mini Displayport to HDMI adapter? If not, purchase one and that will resolve your issue.
If you are already using a Mini Displayport to HDMI adapter, make sure your resolution is set to the maximum (1920x1080 according to Samsung's website) in Apple Menu > System Preferences > Displays > Display.
If available, select the 'Best for Display' option which should automatically set the maximum resolution for the display. If not, select 'Scaled' and choose 1920x1080.
Hello, I am the technician that will be assisting you today. My name is Norman-Wynne Damstra.
Welcome to Fixya!
Is this only on the HDMI connection?
This particular monitor supports another digital input called DVI, a white connector. Connect your monitor to your computer via the DVI connector see if this changes the state of the problem. Also try the VGA connection, however you wouldn't want to run this LCD on an Anolog connection for everyday use.
Also do the following: Right click your desktop and select properties. Click the Settings tab and ensure that the colour quality (found to the right of the resolution slider bar) is set to (Highest 32Bit)
If you find that your monitor works well on the DVI connection then one could say that the HDMI cable is either of bad quality or faulty. Installing the latest available drivers from the AMD website is a good idea, be sure to get the drivers for your version of the windows operating system. (32Bit or 64Bit)
What you'll need to do is set your TV to whatever input you're using on the laptop (VGA or HDMI). Then go into Display Properties, which can be found in Control Panel. Select the grayed out 2nd display and check "Extend desktop onto this monitor". Slide the resolution to something your TV can support such as 1366x768 or 1920x1080. Apply, OK, OK and you're done. The exact steps that you'll need is slightly different than the instructions here because of variation in TVs and OSes, but it's mostly identical.
This also happens to my vga connection to my TV. I used my tv remote "auto" button to re-size it to fit correctly. If your monitor/TV does not have the adjustment, you may need to supply your vga compatible device with your monitor's driver software. This tells your computer what monitor specifications you have.
the problem is not the monitor.To be able to correctly set a dual display mode you need to configure you video card to do so. This is accomplished in your video card's control panel. There are various modes: Clone: it simply clone the screen you'll have the same output on both monitors. Extend: this will extend your desktop and make it one big screen. theres another mode to show video only on one screen while the other display regular desktop activities you'll have to experiment. the procedures for doing this varies depending on you video card: ati, nvidia, or Intel.
The LN40A650 supports 1920x1080 resolution from VGA. I know this because I've done it. It will also support lower resolutions, but certainly not higher. Drop your resolution to something low like 640x480, plug into the LN40A650, then up the resolution to 1920x1080. If this doesn't work it's 1 of 2 problems. It could be the refresh rate. Go to your display settings, click on Advanced, choose the Monitor tab, and set the screen refresh rate to 60Hz. If this still doesn't work it means your video card won't support that high of a resolution.