My 2007 I mac will not start
I Mac 2007. 1. I just loaded Yosemite the night before.
Now it will NOT turn turn on,,,
When i press the ON button I get a very loud annoying noise. I tried to hold down the R P and Option / command as soon as i push button,, Same noise. I hear the Fan and machine working but screen is light grey,, Please help
iMac (20-inch Mid 2007), iOS 7.0.3