projector killed hard drive under newly installed yosemite??

Hi. You should try some thing first to see if it is a disk problem. Pram reset.Command/Option/P/R key at startup for three chimes. SMC reset. http://support.apple.com/en-us/HT201295 Lastly Command/R to try and go to recovery. If you get there you can use the utilities option to run a check and repair of the hard drive. or reinstall.

Hi. Did you even get to a recovery screen? Try Option or Option R. you should then see a recovery drive to boot to.

minopilus wrote:

can anyone tell me, whether my hard drive dying has anything to do with the update to yosemite (my warranty ran out 2 weeks ago)?

I think it is very unlikely that the two are connected.

It is more likely (though not certain) that something weird happened when plugged into the projector. Like a bad cable or a bad port that maybe allowed some kind of power surge back into the motherboard that might have affected the hard drive. But let me emphasize...this is a very unusual problem that should not have happened. Thousands of Mac laptops are plugged into projectors every single day in corporations and schools and universities. It is not a problem that should be expected to happen.

Also, dying hard drives have not been reported by the thousands of Mac users who have also done the Yosemite upgrades. I have two Macs that upgraded to Yosemite without a problem.

I don't know what the real cause was, but chances are it was a fluke. One possibility: The hard drive was already having undiagnosed problems, and this just pushed it over the edge.

Hi. I think you shall need to make an appointment at your local apple store. They do not charge to look at it.