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Sometime this will happen when the Dell machine is stuck in sleep mode. Press and hold to power button for about 10 seconds. You should see the fan spin just a little this tells you that sleep mode is off. now try starting the computer like normal.
I have a strong suspicion that you have burned a capacitor or two on the monitor. You will need to bring this in to have it serviced as it will require the monitor to be opened up and new capacitors replaced/resoldered.
Drain flee power and your PC should work !
Steps to drain flee power:
1. Unplug power cord,
3.Press and hold power button for 30 seconds.
4.Reconnect the battery and power cord and start your system
the resolution set by default when you load your graphics driver is outside the range of your monitors capability.
try starting in safe mode then adjust your resolution to 640 by 480 then restart.
if this works, adjust upwards to 1024 by 768
then up again till the screen blanks.
when it does, dont panic, wait 20 seconds and the settings will restore - you then have the optimum settings for your monitor.
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