MacBook Pro showing loading Screen on TV but Black on Mac

5 pts.
Tags:
Apple
Mac
MacBook
MacBook Pro
My Mac will turn on and the keys will light up and the Apple logo on the back will light up, but the screen remains black (sometimes it lights up about 1 second when I turn it on- no screen but just the backlight). I have tried the trick of shining a flashlight on the screen but there is no display. I tried resetting the PRAM, resetting the SMC, and entering in my password. None of it worked. Then I got the idea to hook up my Mac to my TV with HDMI. Now the screen that I'm seeing on my TV monitor is a black background with the Apple logo and and a loading bar. Nothing else. It (whatever it is) is only a tiny bit "loaded" and it hasn't increased even a tiny bit in the time that I've been sitting here waiting. The screen on my Mac is still black. Any ideas about what is loading or what I should do? Thanks in advance!!
I rebooted in Safe Mode, and at this point I can see my normal desktop on the TV monitor, and only a backlit black screen on my laptop. Could it be that I need a new LCD cable?

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