U2312HM does not have a Dell service tag number

Hi artemisblue,

Dell 24" and smaller monitors do not have a service tag. You would have received a Dell Order number on the original invoice.

Please perform Monitor Self-Test. Here are the steps:

• Turn off both the computer and monitor.
• Unplug the video cable from the back of the computer. To ensure proper Self-Test operation,  remove the Analog (blue connector) cables from the back of the computer.
• Turn on the monitor.
• The floating dialog box should appear on-screen (against a black background) if the monitor cannot sense a video signal and is working correctly. While in self-test mode, the power LED remains white.
• This box also appears during normal system operation, if the video cable becomes disconnected or damaged. During test check if there is a still color issue or display color looks fine.
• Turn off the monitor and reconnect the video cable; then turn on both the computer and the monitor.

You may refer to the link http://bit.ly/Wjj0eg . Navigate to troubleshooting link. Click the link and you will find the step by step instruction on how to run the self-test and the built in diagnostics.

You may also refer to the common problems discussed in the manual and perform the steps given to resolve the issue.

Please share the picture of the screen with the lines and the color distortion.

Keep me posted with the results. I’ll be glad to assist 

http://imageshack.us/photo/my-images/191/81f0.jpg/

everything is good but only left side have problem 

also same situation at PS3

artemisblue ,

24" and smaller Dell monitors do not get a service tag number. They get an assigned Dell Order number but only if you purchased it directly from Dell.
* Go back to the top of this Monitor Forum
* Open "FAQ Monitor"
* Open "Monitor warranties and replacement instructions"

The picture you posted is when the U2312HM is connected to the computer. We need to see pictures of the U2312HM running the BID (Built-in Diagnostics) which takes the computer and all cabling out of the troubleshooting.

* Turn the monitor off
* Disconnect all cables from the monitor except the power cord
* Looking at the monitor buttons top to bottom, press and hold buttons 1 and 4 down for two seconds
* An all Gray screen appears
* Press button 4. The screen changes to Red
* Press button 4. The screen changes to Green
* Press button 4. The screen changes to Blue
* Press button 4. The screen changes to Black
* Press button 4. The screen changes to White
* Press button 4 to exit the test