Trying to swap a hard drive from my mac to an HP laptop, got stuck with an MBR error, so after trying all the above with no success once or ever, I found this solution:

***Be mindful to backup your files prior to trying this. Use an external case and save everything into another hard drive***

Method #1:
1. Boot up to installation DVD/CD.
2. Click install but don’t follow through.
3. Press SHIFT-F10 to bring up console.

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