It works intermittenly

Try following the steps below.
Step 1
Press the power button once. If the TV does not turn on, observe the LED indicator, usually located on the TV's lower front panel. If the LED indicator turned off after you pressed the power button once, it is in standby mode. Press the power button once again to exit standby and turn on the TV.

Step 2
Observe the Standby light if the remote control will not work. If the Standby light stays on, the television is in Standby mode. Press the power button on the television, then try to use the remote.

Step 3
Turn the Energy Saving Switch off, then press the power button. The Energy Saving Switch is located on the rear or side panel on most Sony model TVs. Refer to your TV user manual for the exact location of the switch.

5 red flashes is a bad panel connection or internal panel short, very carefully take the panel connectors off and reseat them and see if that helps, unfortunately you may have a bad panel.

Any fault codes?
what about the flashing Red light?
how many times is it flashing quickly? It will pause between message/code of quick blinks.
To assist, more info needed.

Contact any service technician. It will be best in this case. If you're sound in electronics, and have some previous knowledge in servicing LCD TVs; please respond. Otherwise please !!!!!!!!. Time is precious for us.

Switch off the TV from remote, then switch off the on/off button on the TV, remove the plug pin from the power outlet. Cool off for 48 hours and then retry. If nothing works, better refer it to a qualified service technician.

You have power to other items but if you have none to the ig switch usually a big red or brown wire then there is nothing going back to the starter etc.You say the red is dead. That usually comes from the big starter terminal. Try google images for a diagram if you don't have one. Alternatively if you can easily access the starter take a length of heavy wire and flash between the battery positive and starter terminal and see if it turns over. If so, you have to fault find the supply to the key.

Anyone

Haven't solved it yet but contacted Samsung support and they suggested getting a technician to look at it.

Sounds like the hard drive has had a failure, you need to get a replacement one, and reinstall it, along with the opperating system, and any other programs that were on the old one.

make sure the speaker grounds are connected to the speaker ground wires on the deck and not the "chassis" ground. also make sure both power wires are hooked up to a power source. the thinner power wire is supposed to be a switched source (like the ignition key or an accessory switch) that turns the unit on and the thicker one is a constant source which actually powers the deck once the switched source is turned on.