Bootable partitions won't display on boot selection screen

Hi,
i have four bootable partitions - my regular Mac partition - a boot camp Vista partition - a Time machine partition and a Image partition (created by Carbon Copy from system partition).
Normally in the boot selection screen (pressing alt during startup) i got to see all 4 partitions and could boot from them. At some time this changed and at the moment i only see mac and vista - the Time machine and the image partition are no longer available.
In the mac system panel - start volumes i do see both partitions as it should be. Both volumes are absolutely ok - i have used also the hard disk service utility but there were no errors. Has anybody got a clue why this happens and how it could be changed.
I am not absolutely sure but it could be that both partitions were lost, when i migrated the machine to snow leopard. Maybe this is a clue.
Thanks
Michael

If the Time Machine volume shows in the Startup Disk system preference it must have more than the Time Machine backups on it, all of which should be in a folder named "Backups.backupdb" at the root level of the volume. At the least, it should also have the same System & Library root level folders as does any volume that is capable of booting the Mac or it should not show up in the system preference. Note that these folders alone do not guarantee that the volume actually can boot the Mac.
As for the CCC volume, the same thing applies. If the CCC backup is in the form of an *image file* (.dmg extension) it will not boot a Mac, nor should that volume show up in the preference unless it also has the other root level folders mentioned above.
It would help if you explained exactly what you mean when you describe the CCC volume as an "Image partition" -- it is either a clone that should look in Finder exactly like the source it was made from with the same folder structures or a single file that has to be mounted as a virtual volume by double-clicking on it to reveal that structure.
Also let us know what the root level folder structure is on the Time Machine volume; IOW, if has anything besides a "Backups.backupdb" folder & if so, how the other items got there.

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