I only get a white screen with a crossed circle at startup
When I power on my iMac, it shows me the Apple logo for a minute and then a white screen with a circle with a line through it. I read on this site that this is due to a bad hard drive, so I replaced my hard drive with the recommended 2T Seagate (I am pretty handy). After hard drive replacement, I still have the same issue. I have tried holding down COMMAND R, and OPTION during power-up, but it doesn't change anything. That is supposed to take me to the disk utility menu so I can restore from my Time Machine drive, but it doesn't happen. Only the white circle with a line through it. What else could be wrong?
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