If the booting options(like Single User Mode) and keyboard shortcuts of your computer are disabled or locked by a password, this is probably caused by the firmware protection of Mac Os X. One good way to know that this is the firmware protection, is to hold the ALT key while rebooting. If you see a box asking for a password, this is the openfirmware protection. This is usefull if your system only boot on Windows XP and you want to change booting disk (with ALT key). Here is the solution to reset that password.
To crack the firmware protection:
Change the amount of RAM memory in your computer (remove or add DIMMs)
then you reboot the computer while holding CMD+OPT+P+R. Hold the keys until it restart and you hear the apple song. Release them then hold it again. Wait for restart and release then hold it again (basically you need to do it 3 times).
Change the amount of RAM memory in your computer (remove or add DIMMs)
then you reboot the computer while holding CMD+OPT+P+R. Hold the keys until it restart and you hear the apple song. Release them then hold it again. Wait for restart and release then hold it again (basically you need to do it 3 times).
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doesn't work. help please i bought an used macbook pro by internet and can't reinstall lion
ReplyDeletehow Mac goes to Internet Recovery
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