My Dell 1908FPt monitor, which is about 6 years old, stays dark after waking up from sleep, even thought the green on/off button turns green. When I press the on/off button the screen lights up, but only for ~2 seconds. Then it goes dark. When I press the on/off button a second time, the screen again lights up for ~2 seconds and then goes dark again. On the third or fourth try the monitor stays on. Any ideas about the cause and how to fix would be much appreciated.
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