Dell — monitor problem

Address:

Kanchipuram, Tamil Nadu

vertical line is coming at centre of the monitor, I have changed the VGA, HDMI cable but it can not removed still it is comming and i have changed the pc also but problem is not solved. 1. monitor was purchased at Challenger Computer in chennai-600002 2. 21.5 DELL LED monitor 3. Invoice No 21855. 4. Date of purchase 19/10/2013. 5. customer name V RAVIKUMAR 6. Mobile No [protected]. 7. Email id [protected]@gmail.com