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1. Turn Off Monitor by pressing power button on LCD 2. Shut down computer 3.
Unplug power cable from LCD, Once power cable is unplugged from LCD,
press and hold down the power button on LCD for 15 seconds
4. Unplug the power cable from the back of Desktop Computer and Hold down the power button on desktop computer for 15 seconds
5. Plug the power cables back into the LCD and Desktop Computer
6. Power on computer and then power on LCD, it should work
This is a "feature" imposed upon us by those energy-saving freaks and environmentalist-wackos. What you need to do is press and hold the clock button for 12 to 15 seconds. When you first press this button, the display will appear. Then in about 7 or 8 seconds it will disappear. Keep holding it for 12 to 15 seconds until it re-appears. Now if you release the clock button, it should remain on.
The Powerbook G4 power button functions like a reset button if you hold the power button in for a few seconds until the computer powers down.
Hold the power button in for a few seconds (until you see the screen turn off/go black and hear the fans & hard drive stop spinning).
Press the power button again to turn your computer on.
If you have more trouble, you may need to boot in Safe Mode or "perform a Safe Boot": Press and hold down the "Shift" key immediately after you hear the start-up tone. Release the "Shift" key when the gray Apple icon appears on the screen.
Same problem - unplug both computer and monitor - hold power button for monitor for 15-30 seconds...then power it back on and then power on the computer. Seems from other sites there is a power issue with the monitor - this worked for me.
plug in a different monitor temporarily, check your display settings (right click background, settings, advanced, monitor)
and set refresh rate to 60hz.
plug in this monitor again and see if that helps
some monitors (lcd's especially) cannot handle beyond 60hz
Try connecting the wires properly. try changing the VGA cable. i had the same problem my screen goes black some times and pink i changed the VGA cable it was absolutely fine!!!
What is VGA cable VGA Cables Adapters Converters and Devices C2G
visit a computer mechanic for further trobleshooting