Why is my computer locked
My Mac book pro turned on but I can't use it.i believe its completely locked but not sure
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A new HD possibly - other problems. The flashing "?" or a "?" in a folder means "no boot volume (operating system folder) found". Generally this means you need a new HD.
You should be able to boot from optical media or an external HD with an version of OS x up to 10.6.8 on it. Your replacement drive can not be a new 3-6GB/s SATA II or III but must be 1.5GB/s SATA (or backward compatible to SATA I).
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