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Connect a different monitor. If that BLACK-BAR goes away, then try the monitor on a different computer. If the BLACK-BAR is present on both computers, then the monitor is the problem.
Press F8 continuously while starting the computer. When black screen appears eventually (right before Windows loads), choose Last Known Good Configuration.
In Safe Mode, your monitor will not be listed as it is using a generic device driver for basic display. Go into your video settings and reset it to the lowest resolution available. Reboot the computer into Vista again and your display should be working. If you check Device Manager now, you should see your monitor listed. If it isn't, you will need to load the Vista drivers for it. You can then modify your display settings to suit your preferences.
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!
No, this is typical problem for defective inverter. Mostly screen appears for some seconds and then turn to black. If you are technician, you can use this link :-). http://www.lcdrepair.us/1702inverter1900x.html
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