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Oct 7, 2012 9:04 AM in response to ie.isaacandcoby mundi,You may find these two support pages helpful:
http://support.apple.com/kb/HT1767
http://support.apple.com/kb/HT1379
Try resetting the SMU and the power management reset followed by the NVRAM reset in sequence and see if you have any success. Let me know if this works for you.