I have recently purchased an XPS15 and lately have had the problem of the screen staying black after I close the lid and re-open it. Its setting is to got sleep after the lid is closed but the white light indicator on the front doesnt blink like its asleep anymore. I have changed all power setting back to default in an effort to fix the problem but It has not resolved the issue. If I close the lid momentarily then reopen the screen stays black and I have to hold the power button down for 5 second for a hard reboot.
Any ideas?