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Sustain board fault. Contact any service technician. This is not a user repairable fault.
If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
You can either have a bad Y-Upper buffer board, or dirty contacts on the plug associated with the horizontal line. Best to have a service company look at it.
This might be a mediaplayer issue. Google on EHtray.exe and you will find a microsoft page with a number of filenames related to these kind of problems. Check by pressing CNRL-ALT-DEL and check if you see any of the filenames on the processes tab. Than stop the file and see if the black line disappears.
A line on an LCD, either horizontal or vertical usually means the video driver board is defective or the screen is defective, does it show up as black even on a dark screen? That means a line of LCD "shutter"s is not working and there is a problem that cant be fixed by a reboot or channel change. Bummer.
Sounds like an inverter problem. If the power supply is internal replace the capacitors coming out of the voltage regulators. These are usually 1000mf and/or 470mf. If that doesn't do the trick look up the numbers on the 8-pin chips that drive the secondary transformers on the inverter to see if they are getting the right voltages. Good Luck!
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