I can't get the 1080p resolution to my insignia tv. Anyone can tell me how to do it pleaes?

4k is about 3.5 times the resolution of 1080 and gives a clearer picture

How do I get 1080 instead of 720. - Comcast Help and Support Forums

forums.xfinity.com/t5/XfinityTV-and.../How...1080...720/.../1152741

Jan 3, 2012 - I can switch one of them from one HDMI input to the other HDMI ... The YPbPr option might be set at 720p, and you can change that to 1080i.

How do I change the resolution on my LG tv to 1080p ? - Nvidia ...

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How To Change your PS3 from 720 to 1080p - YouTube

The resolution for TV's is auto sensed by the content being sent to it.
If you are playing a 720p file, you cannot make it 1080p. 720p vs 1080p Can You Tell The Difference Between HDTV Resolutions

You don't. The TV's resolution can't be changed. Only the signal resolution from the source can be altered.

The TV reports the resolution of the incoming signal before it is scaled. If you have a BD player you can see the effect of changing the resolution setting from 480p, to 720p, to 1080i, to 1080p 60, to 1080p 24. The last three (the 1080 resolutions) shouldn't look too different with a Blu-ray apart from movement because the native picture is 1080p 24 and the TV is simply converting it back to 1080p 24 for display.

Yo don't. The TV's resolution can't be changed. Only the signal resolution from the source can be altered.

The TV is a fixed pixel device. The panel has a resolution of 1920x1080 pixels. The incoming video signal is scaled to fit that display. If the signal is 480i then it is deinterlaced to make it 480p, and then scaled up to make it 1080p. The amount of detail in the picture doesn't change. It's still a 480i image. It's just blown up to fill a 1080 panel.

The TV reports the resolution of the incoming signal before it is scaled. If you have a BD player you can see the effect of changing the resolution setting from 480p, to 720p, to 1080i, to 1080p 60, to 1080p 24. The last three (the 1080 resolutions) shouldn't look too different with a Blu-ray apart from movement because the native picture is 1080p 24 and the TV is simply converting it back to 1080p 24 for display.

960i is a funny resolution. That would be achieved by line doubling a 480i signal. But it's not one of the VESA HDTV timings. TTBOMK there's no Blu-ray or HD source that generates a 960i image. So even if you could generate it then the TV wouldn't understand what to do with it.

Look in your menu for the resolution setting and change it back to 1080

The TV will display the signal it is being fed with and adjust itself according to the video signal resolution. The video source tells the TV what the resolution it should display. 720 in 720 out on the screen, 1080 in 1080 on th screen (if TV can do 1080p or 1080i).
What kind of signal you are feeding your TV with.
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide

http://s807.photobucket.com/home/budm/allalbums

Generally speaking, your TV will display the signal it receives. DVD player output, for example, is 480p, but an upconvert DVD player can output the signal at 720p or 1080p. You should adjust your components (e.g. cable/satellite box, DVD/Blu-ray players, etc.) to the desired compatible output.

What do you mean by " What is the code"? 1080p is 1080 lines of progressive resolution.

Are you sure the tv is 1080p capable? Usually when "mode is not supported" is displayed, it means that the tv can not handle the signal format that is being input to it. If you are using HDMI, then signal formatting is usually handled automatically. If you are using component video, you will probably have to tell the PS3 to step down the signal to either 1080i or 720p.