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Does your monitor go black because it went to sleep, does it turn off? Do you have any lights on the monitor to indicate what it is doing?
Also I would boot into safe made by rebooting the computer & tapping F8 when the bios appears. You should be prompted with several options, one of which is "Safe Mode". Choose this & report how the monitor behaves.
if the Toshiba monitor went black:
1)if there is power from the monitor, check power cable and data cable
2)make sure that its properly connected to the computer
3)make sure computer is on and there is an activity from the computer
4)if the is sound from the computer try a known good monitor if that will work
5) try this Toshiba monitor to a working computer
6)try checking the monitor maybe the back light is busted get a flash light point it directly to the screen it self check if you can find something
7)if all is done bring monitor to a repair station if in warranty manufacturer
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Right click on your desktop go down list to properties and left click under the screensaver tab click the power tab and turn off the power saver in other words change settings to always on and no hibernation
Disconnected Data cable from the monitor to the back of the CPU. Do a self test on monitor if u get colors on the monitor it is working fine.
check for loose cables. Try to do factory reset on monitor using buttons on monitor.
If you can still faintly see data on your screen, it will be a faulty backlight in the panel most likely.
LCD panels have fluorescent tubes in them that provide the light needed to see the data. If one of these goes faulty, the circuit that drives it will turn off ALL the backlights, giving you a black screen. Note: a faulty circuit that drives the backlights will often give the same apparent fault. You will need to take the monitor in for repair.