When hit on blue screen with proscan come on then it goes off and on nothing else will come on?

Tuner board flaking...

Fault to its main board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/ . In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.

Check and replace the damaged component/s at its main board. Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/

This is a prime case of bad capacitors in power supply. You may have only had it a year but how old are the parts that are in it?

Have you tried the pinhole reset method yet.?

It has a faulty processor. Unfortunately this TV won't be worth fixing. Put up with it for as long as you can .

it could be that your scrolling the channels and ports for your dish network menu and not your tv menu if your using a remote try changing the setting via the tv itself, also try disconnecting the dish network supply then try try using the net gear stuff, personally I would say get the new x-box one system because it has blue-ray capabilities, stream music and videos, movies, it has Netflix and hulu and all that stuff that your computer and phones can do now including video chat, voice recognition, hands free movements recognition and yeah it just does everything... hope this helps

Do a factory reset.
https://www.youtube.com/watch?v=S4j90hbPftc

ur sister possible turned the sleep mode on.......check on ur remote that is is off......if this problem persist u have to call service to fix ur problem

There is no power coming from the step down transformer