The screen stays black on MacPro tower on startup
My MacPro tower does not light up the screen after startup. The chime goes off, but nothing happens! I have tried holding the P and R and COMMAND keys down on startup, but that made no difference! It has Yosemite10.10 installed, but if I can get it going I want to install SNOW LEOPARD on it as Yosemite seems to have too many bugs in it yet.
Anybody has any good advice for me?
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Just happened to me - I tried this trick & worked! After I hard restarted b/c of wireless issues then it went black with chime sound. No keyboard backlight (when pressed caps lock nothing happens). I did option+commend+p+r+power: nothing. opened back, reconnected all the cables, restart:same black screen. I read this online threads - restart, shine flash light thru apple logo from back of the laptop, I was able to see the apple logo with the process bar moving. Let it go thru (takes time so leave it not holding the flash light all along). When you see login screen thru the flash light, type in login password. In a min or two you will see your screen back to normal. I've got password reset screen for filevault. never seen this before but I checked "forgot password reset" and entered login password and it went thru normal startup. If goes black, shine the flashlight thru apple logo from back of the laptop and you will see something is processing.
por Sarah w