The TV has worked fine, and then when I turned it on today nothing happened. When I tried unplugging it and plugging it back in, the power light comes on but blinks. I tried unplugging everything connected to it, and tried different outlets, but have the same blank screen and blinking power light
If ti blinks three times, then it may be an issue with the flyback transformer. It's called "three strikes"...it tries three times to come on, and after that enters a safety shutdown mode to protect the TV. Might need to have a professional shop take a look at it.
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I have the same problem - its a HDCP handshake issue. Sony says the firmware in the Westinghouse TV needs to be updated - Westinghouse says that they have firmware updates for some models depending on your TV's serial number, otherwise they are working on firmware updates for the rest of us that should fix the problem. Call Westinghouse to see if you can get updated.
I'm assuming your screen shows nothing at all, even the bios or boot screen as it turns on.
If you can hook it up to an external monitor then your video adapter is working. Try using the vga output on the laptop. If it doesn't show anything use you display select feature. I'm not sure what button it is on your laptop but on mine it is Fn+F8 (look for a button that shows a laptop and/or a rectangle).
If you can see it with an external monitor, you should try to uninstall and reinstall the video adapter. After you reboot the computer hopefully it will work.
However, if it still does not work, you will probably need to reseat the monitor cable. Do this by opening the screen panel. on the back is a flat cable tat plugs in to the LCD. This is usually covered by tape. Carefully remove the tape, unplug the cable and plug the cable back in. Don't forget to replace the tape! I have fixed two computers in the last two weeks by reseating this cable.