White screen apple logo cannot get to desk top
By mistake I chose to change the start-up disk, my mac was working great no issues at all until I decided to re-start it, well now it cannot restart I cannot get to the desk top, I have the white screen with the apple logo and status bar that doesn't load. after a while the status bar goes away and I get a circle, then nothing but the white screen and apple.
I am using a windows key board, but command R doesn't do anything thing. I was able to get to show me a picture of a drive to start it with but this is the main hard drive and I think it has a problem. It's a huge computer no longer under apple care and I would have great difficulty bringing it in. Can someone help me restore to the other start up drive until I can it repaired I am in tears I love this MAC. I hope is not dead.
Is this a good question?