The green power light flashed 8 times then flashed red 5 times and wont turn on

SOURCE: No picture or sound - Power Save light blinks red 5 times - nothing on the screen

Best first step = change lamp

SOURCE: tv wont turn on has a funny noise

You likely have a bad lamp. It could also be a bad lamp driver, but I'm betting a lamp change will solve your problem. Buy an original Sony lamp only; the aftermarket replacements are cheaper but you get what you pay for and they can cause problems. Please be sure to rate this solution. Thanks!

SOURCE: my tv is blinking red in the power indicator 4 times on my KDS-50A2000

I had the same problem. Red LED blinking 4 times. This error means that one of the fans is NOT spinning! To check.... unplug the tv.... turn the TV around to a well lighted area so that you can see the fans in the back... plug the TV in and turn it on. Watch for the fans in the back... and see if they are spinning. If not... that is the reason why the TV will not turn on! In my case, the fan next to the lamp was stuck for some reason. I removed the the cover of the TV from the back... and cleaned the fan, made sure all connectors to it were properly connected... and viola! The TV is perfect again! Enjoy!

SOURCE: KDS-50A200 NO power up, red light flashes 5 times.

It is the lamp ballast.

SOURCE: sony sxrd 60 in, won't power up--blinking red light 5 times

You need to replace your bulb. Order a replacement online---it's easy to swap and the instructions are in your manual. If you purchase one from a local dealer you will pay over $150 more!!!