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If you turn the monitor off then about 1020 sec turn it back on and have
a picture for five sec again it sound like the power supply in the
monitor. but if that did not solve the problem, the
picture board on your monitor is bad, since it goes off after few
seconds and the power led or button is on, it means the
board of your monitor has developed fault and will need to be replace.
advice you replace the picture board on the screen of your monitor to
solve the problem of the blank screen.
Ive seen this on other monitors. Look for a 1 and 2. Some monitors do NOT auto detect a signal, and this one might not. Look for a way to set the monitor from Digital input to VGA input. Try that and see.
First, confirm that it is the screen itself. Connect the video output to a known working monitor and then power on your Thinkpad. if the known working monitor behaves the same way you can rule out the laptop's monitor as the source of the problem. This may be the BGA, Ball Grid Assembly, leadless soldering problem related to video chips on the motherboard, but first test the monitors.
This looks like a problem with the video card or the power supply to the monitor. Try connecting a different monitor and if you still face the same problem then probably you may need to have a look at your video card or its connection in motherboard