Display sometimes goes dark but iPad is still seen by iTunes.

Display sometimes goes dark but iPad is still seen by iTunes. It can sometimes be fixed by rapidly hitting the power button and holding the home button.

Holding the home button and then pressing the power button ALWAYS takes a screenshot and I can hear the screenshot sound.

The screenshot it takes when dark 99% of the time is of the lock screen, but sometimes it takes a screenshot of a blank screen. Perhaps that is after the screen sleeps.

The problem is very intermittent; sometimes the display will work for weeks, sometimes for minutes. Started doing this out of the blue, no drops or bumps before it started.

Seems like possibly a connector or voltage issue?

I would say power button, but the power button ALWAYS works for screenshots.

Any ideas? Right now the dislay is not working and I'm having problems getting it back on.

I have tried opening the iPad and do not see anything out of the ordinary.

Any new ideas?

Still no luck. Anyone??