White screen with a folder and a question mark in the Folder

Hi,
My daughter's Desktop Mac Pro won't reboot. On reboot, it shows a white screen with a folder and a question mark within, It just stays there and nothing happens. Is this a problem with a dead hard drive, dead processor, faulty USB connection, problem with airport.? We need advise and help, please!
effie imperio

Hi, Anonymoustache, thanks for responding.
Yes, I think it is "a flashing question mark". If it is flashing, you think it is a hardware problem like a dead hard drive? I had a flashing question mark with my Power book G4 and Apple replaced a dead hard drive.
Thanks Hatter, I will convey your response to my daughter and see if it will help.
effie imperio

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