Do you see the issue when the monitor is disconnected from the computer and you run the Built-in Diagnostics, page 33?

No it appears in gradients , videos

i have run built in diagnostics

but also same issue

i have removed my graphic card and connected my monitor directly to mother board with vga cable and hdmi cable but issue is same

i have connected my pc to other monitors it looks perfect

Here are Built-in Diagnotics done images

like this its appearing 

before i have'nt installed ddm

now  i have installed i have changed the settings and saw same problem

i have connected to other's pc also

Ya i have installed i have changed the settings and saw same problem

i have connected to other's pc also

I do not think the monitor is faulty. Did you install the Dell Displays Manager? If yes, did you test video BEFORE installing DDM?

Ya Tomorrow Engineer is coming to check

what would be the problem

Then get it exchanged.