Hitachi TV Blew out something?

[supertechmark]

Hello, Help please,
I have a 2002 Hatachi big screan tv , model # 43GX10B, was working fine.
I hooked up a surrond bass box and amp on to the Monitor Out port that had not been used. All was sounding great, until I turned the stereo on, to use the amp on the stereo as I had in the past as a vol. booster.
Thats when everything just shut off, picture, sound everything????
Now when I turn it on the red power lamp on the front blinks 3-4 times and then nothing. If I hit the on button again ...nothing. Now if i unplug it and plug it back in, then hit the power button it will flach the power lamp again....but then thats it.
I saw 2 fuses in the back one near the power cord and one on the bottom in the middle ...both are good?

Help! where can i look next? I can solder and repair PC's but not great at testing w/o a road to follow.

Thanks Mark Hatheway
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Mark Hatheway