If you experience system problems after a successful startup (i.e., after the Finder appears on the screen), most likely the problem is not with the iMac hardware (with the exception of some possible RAM issues).
Following are troubleshooting tables with problem symptoms that you may see after the Finder appears. Possible causes for each symptom can be found in the left-hand column with the corresponding fixes in the right-hand column. The troubleshooting information is presented in the order of the most probable cause and fix; therefore, Apple strongly recommends that you carry out the troubleshooting in the order in which it is presented.
Note: If you are instructed to replace a module and this does not fix the problem, be sure to reinstall the original module before you proceed to the next fix.
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