Sony BRAVIA KDL32WD751 stuck on one channel, no interaction

Sony BRAVIA KDL32WD751 stuck on one channel, no interaction

TV was working well, no problems. I had unplugged tv from mains when away for a couple of days, on my return the TV came on, so picture is fine, but, no volume and it will not respond to either the remote, not does it respond to the on /off button on back of tv.

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