Two choices:

 

1.  Take to local TV repair facility or computer shop who claims to repair monitors. Does not pay generally to send to Dell for repair, particularly if the monitor has a few years on it.

 

2.  Take to recycle bin and purchase new monitor. 

Regoles,

Verify that the monitor is defective.

Does the issue appear during the Monitor Self-Test Feature Check (STFC)?
* Turn off the monitor
* Plug the monitor power cord directly into the wall socket to remove any surge protectors or APCs from the troubleshooting equation
* Unplug the monitor video cable from the back of the computer video card
* Turn on the monitor
* The floating red/green/blue/white dialog box should appear on screen against a black background

If the issue does not occur while disconnected from the PC video card, the problem is with either the video card driver or the video card itself.

If the issue does occur while disconnected from the PC video card, and the monitor is still under warranty, get it replaced. If you have a service tag number associated with your monitor, you may use Chat or Email support to setup the monitor exchange. If you only have an Order number associated with the monitor, you must call in,
1-800-624-9896. They will need the following information -
20 digit PPID number on back of monitor
Name, address, phone, email address
Order number
Issue
Troubleshooting done