please help me. imac 2012 problem

[studiook]

Hello
After I turn on the computer I see a question mark with a folder and mark Interchange few minutes of no entry sign.
I have tried to click on ALT after starting and after I get the drive selection screen - the Mac can not find a drive.
Is there anything to do without a technician?
Thank urgent

 

[studiook]

when i started startup disk and try to repair it said

partition map repair failed while adjusting structures to fit current whole disk size.

when i tried to choose startup disk - it dont find me any harddrive ?!

 

[hfg]

You might try a PRAM reset:

Reset the PRAM. After pressing the power button, hold down these keys simultaneously: Command-Option-P-R, until you hear the startup chime at least one additional time after the initial startup chime (I let it cycle for 3 chimes).

PRAM reset:
http://support.apple.com/kb/TS1365

SMC reset:
http://support.apple.com/kb/HT1411


Otherwise, it might be a bad or corrupted disk requiring reloading of the OS or replacement of the drive.

 

[studiook]

You might try a PRAM reset:

Reset the PRAM. After pressing the power button, hold down these keys simultaneously: Command-Option-P-R, until you hear the startup chime at least one additional time after the initial startup chime (I let it cycle for 3 chimes).

PRAM reset:
http://support.apple.com/kb/TS1365

SMC reset:
http://support.apple.com/kb/HT1411


Otherwise, it might be a bad or corrupted disk requiring reloading of the OS or replacement of the drive.

i did the PRAM reset 3 times - and still same problem
any other solution ?

 

[hfg]

i did the PRAM reset 3 times - and still same problem
any other solution ?

Well, at this point I would probably start thinking about OS X Recovery, first to use Disk Utility to verify the disk is still active and repair disk to see what it reports. Next would be to restore OS X with the hopes of keeping my personal files intact (I hope you have a backup). Finally, if all else fails, use Disk Utility to repartition the disk, restore OS X, and restore my files from my backup. If the disk itself has failed, you will realize it at some point in this process.

http://support.apple.com/kb/ht4718

If you have an external drive you can attach, you might install OS X to that drive, boot from it, and take a look at what is available to recover from the original disk before you destroy it all with repartitioning. I always like to keep an updated external clone disk available for just this type of occurrence.