Trying to revive the dead...
I have owned a LG Nitro HD since April 12. From 7- 8 months since owning the phone (after upgrading to official ICS), one fine day got a dark red screen (sort of a halo). After that started getting different design patterns on the phone. But the phone used to start even after that. This occurred few more times and the phone refused to boot at all.
Since the phone was in warranty, got it replaced.
Fast forward to September-13 with the replaced phone. I had rooted the phone and had tried different ROMS too. The phone was working fine.
Again, one fine day, I saw that dreaded red screen halo......and thats the end of it. Since then the phone has not booted. When trying to boot, it shows the LG logo, but then the screen just fades away. However i am able to go to the factory reset screen using the volume and power key.
Took the phone to ATT, they said it seems to be an hardware issue. And the phone was out of warranty, so bad luck...
I tried using the unbricking methods mentioned, but since the phone is not detected on PC nor able to do anything from the phone, so I have lost any hopes to revive.
Wanted to post since about a month, but was reluctant. Just saw this thread and thought of seeking if there is any sort of solution to this.
Here is the one of the pattern screen that i see on my phone.