Power indicator flashes red/green. does not turn

These blinks [flashes] are fault indication (Error Codes). From the number of blinks occur at one time switch ON, you can get an idea about the faulty circuit section inside it. This will make repair easy. These are called blinking codes. Make sure about the exact number of blinking of the standby/power LED, by switching On & OFF the set, for at least two times. Count it carefully. If you wish to get some details, check the site linked here. It has details about blinking codes, and fault locating procedure, to many popular brand TVs and other devices.
http://electronicshelponline.blogspot.com/
http://electro-medical.blogspot.com/
Blinking codes details of many popular brand TVs are given. Surf the site with patience.
If blinks continue without any pause, the main board is faulty.

These blinks [flashes] are fault indication (Error Codes). From the number of blinks occur at one time switch ON, you can get an idea about the faulty circuit section inside it. This will make repair easy. These are called blinking codes. Make sure about the exact number of blinking of the standby/power LED, by switching On & OFF the set, for at least two times. Count it carefully. If you wish to get some details, check the site linked here. It has details about blinking codes, and fault locating procedure, to many popular brand TVs and other devices.
http://electro-medical.blogspot.com/

It is a bad symptom. Might be related to its display panel. Contact any service technician to confirm. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" will make surf easy.
http://electronicshelponline.blogspot.com/

What model of tv is it?

llok for Bad Capaciotrs on power supply board they will be vented or swollen on Top. 1000uf 16v 2200uf 10v 3300uf 10v

mine just did this tonight as well.... no answers yet?

Most likely a power supply problem. I recommend taking this to a certified technician and having them look at it.

For LG DU-37LZ30 specifically - On the power supply board, look for IC101, an 8-pin DIP IC. There will be three smaller electrolytic capacitors near it (C107, C113 and C125) marked 47uF, 35V. I'm being lazy here, but replace all three (only one is the real culprit). What is happening is that one of these caps is charged by line voltage until the IC (power supply controller) can start running. When this capacitor gets leaky, it cannot reach the proper voltage to start the controller. I used a 47uF, 50V replacement.
I have fixed two LG sets with this same problem. The other was a 26". It's a cheap fix!

The flashing red indicates that either the fileter cover or the lamp cover is not installed correctly. If both are installed properly and secured, the unit will require service.
Dan

Possible error on JB board - diodes D5701, D5703, D9616. Replacing them should be sufficient. Anyway, you should contact the nearest Sony Service. Regards, Arpi