Tvs red light under lamp keeps blinking and it wont turn on

There was a firmware update from Sony for power up & down problems for the KDFE42A10 among other models which were made in July 2005. If you go to the Sony website (service/support) you can find a link where you can enter your model # and serial # to see if your TV is affected.

The update takes an authorized service guy to come to you home and load the new firmware from a USB memory stick. It takes approx 5 minutes to do. Mine has worked flawlessly for three years now and it was Sony who contacted me to do the update within the first few months I owned the TV.

You should have this done if your TV is affected. Sony indicated that power on and power off problems could begin after six months or so if the update is not done. Sounds like it may be the same issue unless your lamp is bad.

Also, if you have recently had the lamp door open for any reason, you need to ensure it is closed and locked correctly or the lamp light will flash three times in red and won't allow the TV to start up.

This is all covered in the manual under the Troubleshooting' section and is also referred to in the first few pages of the manual where the LED are explained.

Good luck !

Donnieboy - fellow Sony 3 LCD owner

Here is the site with the firmware info he was talking about.

http://www.updatemytv.com/

There is a place to you can put your serial number to see if your model is affected.