Startup disk appear

Hello everybody,
I have a problem with my iMac 24" late 2007.
SInce last Summer I have been having problems with iPhoto and Aperture concering my Canon 70D's raw files (only raws); a lot of Times I must restart the computer, peehaps it can depend on the ram (only 4 gb).
But yesterday I turned it on and in the display a flashing folder with a question mark on a grey background showed up. Now I am unable to do anything as using Sistem Utilities the Startup Disk doesn't appear.
I also tried to connect it to my MacBook in T Mode but it doesn't appear on the Macbook.
My question is: what can I do to reinstall the OSX Yosemite all over again? And could it be the hard disk or is it only a software issue?
Thank you for replying.
Fabriizo

Hey Fabercula,
Thanks for the question. If I understand correctly, the computer will not boot to the desktop. I would recommend that you read these articles, they may be helpful in troubleshooting your issue.
Mac OS X: Gray screen appears during startup - Apple Support
OS X: About OS X Recovery - Apple Support
This feature includes all of the tools you need to reinstall OS X, repair your disk, and even restore from a Time Machine backup.
Thanks for using Apple Support Communities.
Have a good one,
Mario

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