If your mac is a laptop, unplug it and remove the battery. Then reinsert the battery and plug it back in. That takes care of a number of problems. If that does not take care of it, insert your instillation disk. Boot with the C key held down after you hear the tone. When it gets to use English click enter. Take your finger off everything. You wait. Look in the upper left hand corner. You will see utilities. You go there. When you get to disk, You click Mackintosh. You want disk utility. First aid. Verify disk permissions. Repair disk permissions. After going through that you reboot from the C drive.
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