Mac monitor goes black after start up
is it a separate external Monitor or is it Part of an iMac.
Press Power On Button to reboot. Then immediately hold down these keys.
Cmd, Option, P, R, Keys all held down together.
Keep them down and you should hear another restart sound
Keep the Keys down
You should hear another startup chimes.
Do this for three or four startup chimes then let the keys go.
This Resets the Parameter Ram and may reset the monitor parameters to clear the problem.
You can also boot with the Option key held down.
Choose the Recovery OS Drive from the screen menu.
It will reboot from an alternate very basic OS.
You can run Disk Utility from here to test HD etc.
But if this screen stays working then you have a problem with your OSX that is on your Macintosh Disk drive.
You could also keep the SHIFT key down after the startup chimes.
This is SAFE Mode
Keep it down till you see some movement on the screen.
It will take a lot longer to boot up and you will have limited capabilities. this may also fix some parameters and extensions in the background which may fix the problem.
Then ReBoot as Normal an see what happens.
If the above works then it shows black screen again which a normal boot then it would be a good idea to get an external Hard Drive for your Mac. Plug it in and use Carbon Copy Cloner (CCC) to make a clone of your existing HD. This will be a complete bootable copy of everything on your HD.
Once the Clone Copy is done. Proove that it is Bootable and contains all your files. ReBoot with option Key Down to choose the new clone to boot from. If All OK then...
Next step would be to use Disk Utility to re format your Internal Hard Drive and re install a new clean updated version of your OSX back on to your internal Hard Drive.
Then reboot and follow prompts to "Migrate" original hard drive files & settings back to the new OSX.
Reboot to your new fixed clean Updated Mac Computer
Apple Make it so easy.... try this with windows... Yea! Right!
Sep 05, 2014 |