When booting on alt, only my external HD (ccc backup) shows on screen. I can't select my windows partition nor my OSX partition. But when booting normally osx boots perfectly.

when booting on alt, only my external HD (ccc backup) shows on screen. I can't select my windows partition nor my OSX partition. But when booting normally osx boots perfectly.
In osx, all three partitions show when i go to preferences-... (osx is selected as default boot disk)
i don't dare to select windows as osx doesn't show on boot with alt
thanks for your help.
eric

Try a PRAM reset:
PRAM RESET
Zap the PRAM
Shut down the computer.
Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.

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