Green flashing power indicator light

Nope. It appears that you now have a main power supply issue since the set is dead.

Have you even replaced the bulb / lamp on this TV - other than the green light - did they turn solid red / orange at any point? My initial thought is you need to replace the bulb.

The front panel LED light indication "LAMP" flashes?Change the the tv projection lamp or LED lamp first,see what happen?Than go from there?Tvs with "LAMP" LED indication light flashes,tv 1 1/2 or 2 years old use like 4 or 5 hours a day.The projection or LED lamp or bulb,inside life span is over.Require changing LED lamp or projection bulb.

Green light flashes 5 and then red light flashes 6

Please intimate exact model of your Sony TV to find out reason of no power up.

Here's an excerpt from the Sony Manual online. And the link - http://esupport.sony.com/US/perl/webtree.pl?template=EN&mdl=KDF55XS955&content_id=68&category_id=11&problem_id=52

The POWER/STANDBY (red) indicator flashes three times
If your power/standby indicator is flashing in a pattern of three flashes, this may indicates that the lamp cover is not attached securely. Follow the directions in the Operating Manual under changing your lamp that related to closing and securing the Lamp Cover. Ensure that the Lamp Cover Door is securely fastened by tightening each screw.

The POWER/STANDBY (red) indicator flashes continously
If your power/standby indicator is flashing continuously, and the lamp cover has been secured, your TV may be in need of service.

The POWER/STANDBY indicator is lit up green (not flashing)
A sustained green light indicates your TV is on.

The POWER/STANDBY indicator is lit up red (not flashing)
A sustained red light from your power/standby indicator simply indicates that your TV is in standby mode. This shows you that your TV is ready to be turned on with the remote.

Is it the power light and not the lamp light? If the lamp light is flashing then replace the lamp.

My apologies Pete but I just saw your request until this morning and I was going to suggest to check for any loose or unplug wires/cables.

I'm glad everything worked great for you.

hy i got a toshiba 42" LCD tv ,when i press the power boton
iget the red light,& it stay that way ontil i pressthe power back off
thanks for any help

i have the exact same issue.
have you found the cause?

Possible power supply problem or horizontal circuitry....
Best to have a tech check it....light box chassis comes out
fairly easy to go to a shop for analysis.......T.