Lc320emb1 TV turns itself off as soon as I turn it on.

The digital light processing, or known as the DLP, TV uses a main board to project the image onto the TV's screen. If the board goes bad inside the TV it will cause the electrical components to overheat which in turn can cause the TV to shut off by itself. In those cases the TV will generally try to turn it's self back on after it has turned off.

Fault with main board. Damaged 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/

The problem is a voltage dip. I can reproduce this on the same model TV by turning on the A/C or the oven and dryer at the same time. As soon as I hear the thermostat click on the TV shuts off. Just order a voltage regulator today, will see if that works.

Your Mother Board on TV Burnt Out,same thing just recently happen to my LCD TV,,,,

What you've heard is right. This is a main system control memory IC fault itself.

My flat screen will not turn on the green light flashes for a while then stops

Unplug the TV from Wall, wait a bit and plug back in. Should be reset.

If this TV turns back only when it is cooled down than it has cold solder joints tha have to be resolderd.

check for warranty period, you can bring it back to where you purchased the unit since it's still under warranty.

Sound
Sounds like your bulb is nearing the end of its life span you will be needing a new bulb soon.