Macintosh HD icon/prompt when booting - Why that?

I have updated to 10.4.7 a few days. My mbp has run fine until today, when i have turned on my MBP and i was prompted the Macintosh HD icon, with a small arrow underneath.
Clicking on either (icon / arrow) would not result in anything, but pressing enter MBP would start booting as normal.
It never did so before, so I am wondering whether I should be worried about it.
Any idea?
thanks a lot, as usual..

Hi Fede,
Check in System Preferences>Start up Disk that the
Mac OS X 10.4.7 icon is selected.
Adrian
That was it, thank you very much!!!
ciao
fede

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