Last post for now (-:
The behaviour is consistent: when there is a USB of Firewire drive attached the "About" tab shows startup disk information. As soon as I eject the drives it does not.
I have never seen this behaviour before, but it happened right after I restored my backup and has been consistent ever since.
The fact that it also did happen right after the clean install makes me think that it may actually be a feature: Only when there is more than 1 drive in the system does the "About" tab state which drive is startup drive.
Only, on my 2009 MacBook Pro, which is also running 10.6.4 the startup drive is always stated. However, there seem to be a lot of guys around, who see this kind of behaviour:
http://forums.macrumors.com/showthre...is+mac&page=51
and here:
http://forums.macrumors.com/showthre...about+this+mac
As one guy puts it in the last forum: "You'll only see that startup disk option if there is a network attached or some HD other than the one in your computer that is attached. Thus, it gives you the option of booting from another source. If nothing else is attached, the OS won't display that option in the menu." So maybe that is just it.
E.