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Message: <blockquote data-quote="AlfaKen" data-source="post: 1028493" data-attributes="member: 74668">Hi allA friend asked me to install Windows on his new iMac (27") and there was a problem during the install - memory address error - so I followed the Apple instructions and uninstalled the partition.Problem is that there is still something there trying to go down the windows install procedure and on power up a message "... can't find boot disk..." appears.Am I correct in assuming that there is something like a boot command still "installed" either on the hard drive or in the equivalent of the BIOS?I can reformat the drive but am not sure that will get rid of the problem.All advise greatly anticipated!Ken  <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite3" alt=":(" title="Frown    :(" loading="lazy" data-shortname=":(" /></blockquote>

Verification: How many occurrences of a n-u-m-b-e-r between "d" and "f" in this example...(sdgs6ngklu3gd#f9%)?