Mac does not start and a cartel with a question mark appears. what does it means?

it's the second time it happens. I start Mac and a folder with a question mark appears, then I close and restart and Mac opens normally. What's going wrong? Thank you for any help

Welcome to the Apple Support Communities
The question mark appears when your Mac can't find a bootable volume to start from, and it may indicate that your hard drive is failing.
Open Disk Utility, select Macintosh HD in the sidebar and verify the disk. If it finds a problem, you will have to repair the disk, starting your Mac from the Snow Leopard DVD

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