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I think my tube is out, and maybe more?

My T.V. is a sony KP-53XBR25. I turned my T.V. on one morning, and about 30 seconds later it shut off and won't turn back on. I saw that the two outside tubes are popping, but not the center one. I'm just wondering if it could be a bad circuit to the middle tube. The tubes flash when I plug it in, but every so often it won't do anything. I've stopped messing with it and will probobly call around tomorrow, but I am very interested in any insight to my question which can be offered from any expert t.v. repairers out there. Thanx

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