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I had successfully installed Windows 8 Consumer Preview on my mac mini (bootcamp install) but Windows crashed during the upgrade to Release Preview and I removed it a result. But there seem to be some traces of it left.

How do i remove the efi boot entry from the mac's boot menu. I managed to mount the efi partition and deleted the windows folder in it but i still get an efi boot option when I press the option key at startup (of course selecting this entry does nothing now). Is there a boot menu file with the default entries ?

When I try to install windows 8 release preview with bootcamp again (bootcamp does the partition, creates the bootable usb key from the iso and download the windows software) I get the error message :

"The selected disk has an MBR partition table.  On EFI systems, Windows can only be installed to GPT disks"

Yet I see no mbr partition, so I assume there must be some traces left by the windows installer on the mbr of the disk. Is there a way to clean it up ? Or does the error message come from something else ?

EDIT : bmike's suggestion worked

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Have you tried booting to a lion recovery HD and repair the volume? Deleting, resizing or adding a volume should force the disk utility to rewrite the partition table and hopefully correct the error. – bmike♦ Jun 10 '12 at 16:06
Thanks : booting off of a lion recovery usb key did the trick. I was able to resize the partition which eliminated the error. Now i'm stuck with a black screen after windows 8 rebooted but that's an entirely different issue :) – Shigar Kenze Jun 10 '12 at 21:09
Go ahead and answer this. I can answer it too, but uou had to test it so go ahead and answer I you want. It helps everyone to have an answer... – bmike♦ Jun 10 '12 at 21:42

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