my apple mac shows a symbol of folder with a question mark on the screen and beeps

My apple imac seems that having frozen with a white screen, a folder symbol flashes on and off the screen, file symbol has an exclamation mark on this subject, the computer has a beep but has now ceased, any idea on what is the problem and how to solve?

What to do with all these "beeps mean at the start? - http://forum.insanelymac.com/lofiversion/index.php/t62919.html

Power on self-test beep definition - part 2 - http://support.apple.com/kb/HT1547 - old Macs

Mac Power on Self Test RAM Intel processor error codes - http://support.apple.com/kb/HT2341

iMac (mid 2007) and later models: on startup tones - http://support.apple.com/kb/HT2538

Flashing?  Means the computer cannot find a valid boot disk.

Tags: Mac

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