iMac, boots on the desk and then immediately crashes on the color wheel

Thanks for taking a peek at my question.

When I boot my iMac, everything starts up fine in the beginning - he's going right on the desktop, the mouse moves around and, if I'm quick, I can even click on 1 maybe 2 things until the computer completely locks the spinning wheel of death color.  I can still move the wheel on the screen with no latency, but I can't do anything in fact.  Typing on the keyboard does nothing, although the caps lock key will light up.  Boot in safe mode produces exactly the same results, except that it asks me to log in first.

Something must be start I need to get rid of, although I not much to install on this computer and rarely changes (it is a demo machine that lives in a small computer lab that I managed, off-grid). I never had any problems with it, then one day, this problem started.  Maybe I ran an update of the OS and that caused his crash?

I am very familiar with troubleshooting a Windows computer, but Mac does not really offer many intuitive troubleshooting options, IMO.  This seems to be a fairly simple matter to reslolve, but my research online have not produced results - people seem to suggest the safe mode and command line solutions, but safe mode doesn't change anything and I can obviously not open a command line to type anything.

The iMac was bought to 2010 and I'm 99% sure there Yosemite installed, but unfortunately I have no way to be able to check at the moment.

Any help welcome, thanks!

Start of recovery volume (command - R on a restart, or hold down the option/Alt during a restart and select the Volume of recovery). Run the check/repair disk utility and repair permissions until you get no error. Then re-install the operating system.

OS X recovery

OS X recovery (2)

Tags: Mac OS & System Software

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