Mac does not show startup volumes

Hello, I've got a problem with my MBP!
It's the latest model (Core i7) and I'm using it with an Intel X25-M G2 SSD (160GB).
On a third partition of the SSD, I installed Windows 7.
(a little gaming, a few win-only applications)
Booting Windows (or from CD/DVD) should be possible by holding down ALT.
This worked fine for years on my old devices - But this does not work with my new MBP! Holding ALT during startup ends with a grey screen showing nothing! Without ALT, my MBP boots OSX. In the System Preferences I can choose to reboot to Windows (or from a CD/DVD). This works without problems, Windows boots...
But why can't I select my bootdevice by starting with ALT down? Any Ideas?
And please don't tell me to install reFit! I'll never do so!
I'm asking because I'm a little afraid of what to do in the case of reinstalling OSX to a broken/empty Drive where I can't select my bootdevice from within the running OS...

I definitely do not need to modify my Mac that way.
Selecting the startup-volume is possible without refit, or at least should be and works on many many Macs I know/own.
As long as a feature is provided by any "preinstalled Tool" I wont use 3rd party. If a feature is missing I write my own program - but I'm not going to write my own bootloader...
So why does my 2010 MBP have problems with showing startup volumes when booting with the "ALT"-Key?

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Message was edited by: helps
Message was edited by: helps

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rm ~/Library/Preferences/.GlobalPreferences.plist\ .[+your letters+]
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Message was edited by: helps

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