On start up on my g4 notebook the screen flashes and goes blank did a option comand r p and now a dos look comes up on start up i think one of my kids deleted something
Try reinstalling MacOS on your laptop, as far as I know, all Mac come with recovery disks. To boot of off a disk, make sure the disk is in the drive , reboot the computer, and press C while the chime is playing. You SHOULD be able to reinstall. What your describing usually happens to very old iMacs that have bad, incompatible, or no RAM installed. If none of the above works, take it to an Apple Store, they were very helpful when my iPod had a bad battery
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