Questioning Mac on start up

When I am starting up my iMac, I am now getting the 'questioning Mac' for a short while before it starts up. That's like a folder with a question mark appearing on the screen.
I can't think why, I have one operating system and my HD is not partitoned. I have no DVD or CD in the drive. It's not just a one off, it's happening all the time, and I'm not to happy. I had this before on my iMac G3 which was dual boot and occasionally I'd boot into OS9. But not on my new iMac. I feel a bit uneasy about seeing this. Any suggestions?

It sounds like your boot device (your hard drive) is not select. When no predefined boot device is selected, the Mac will show the folder/? screen for a short time, while it examines the hard drives. CD/DVD drive, Firewire, and Network ports for a bootable device. Once it finds a device to boot from, it continues on normally.
Go to System Preferences, Startup Disk, and make sure your hard drive is selected as the boot device.
Tom N.

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