Did you remove the HDMI cable and try another cable? If someone hit the cable ends to the computer or the TV it could cause a short in the cable and/or cause a disconnect at the port on the TV or Computer. Try to remove the male HDMI cable to another HDMI female port on he TV and see if that works. Usually, if the TV reports HDMI activity but you cannot see a movie; the problem is usually at the Computer end.
The cable may have trouble
SOURCE: Panasonic TH-42PX60U HDMI stopped working
Please unplug TV from AC outlet and replug it after 5 minutes then check HDMI port.
SOURCE: Auto Switch does not work for HDMI inputs
Try this:
http://www.avforums.com/forums/6539544-post3094.html
SOURCE: HDMI inputs are not working
As crcelect suggests you can run the TV on RCA. You should also be able to use coax directly from your cable box. If you don't have cable you can use an rf converter to connect coax.
I have exactly the same problem with my Panasonic TH-42PX75U. I've been told that I may need to run a setup on my cable box to fix the problem. If I find a solution I'll provide details in a future post.
SOURCE: panasonic th-50pz80 10 flashing blinking red lights
The way to solve the problem with the TH-50PZ80U blinking light problem is to not buy Panasonic Products. I have had my TV about 21 months and it has started with the blinking light problem, just out of warranty. Panasonic is aware of this problem and refuses to do recall or fix the tv unless you are within the warranty or have bought the extended warranty. Legally they are within their rights, but I am also within my rights to air my complaint and inform others of this below par product. Who wants a TV that they have to unplug for a while and pug it in again for it to work. I want to push the power button and it come's on. I will never purchase another PANASONIC PRODUCT.
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