If you can change the channel, it might fix the problem. Mine was doing the same thing. After I hooked it up to a coax, I changed the channel, it was on #1 once I got it to channel 3 every thing came back. Try It.
You need to trouble shoot your power supply. There is a toshiba power supply and shutdown circuit troubleshooter available for your model at the following link for 10.99 They will also provide free unlimited assistance after you purchase a manual. They will either mail it or email it. If you'd like it emailed you must return to the site after purchase and click on the contact link and request that they email it along with the info on how to obtain the free support. just provide the email address you want it sent to. Hers the link. http://servicemanuals.vstore.ca/
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