I have these exact symptoms. I'm running Maverick and this started about
a week ago after an update. Today I discovered by chance that if I
disconnect my USB keyboard before booting, the grub menu appears. I can
then connect the keyboard and boot like normal. I've tried it several
times with and without the keyboard connected and it's repeatable every
time. This has never been a problem before so I don't think it's likely
to be a hardware problem.

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GRUB will not load on install.
https://bugs.launchpad.net/bugs/630586
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