What device is this on?
When you see a circle with a slash symbol instead of the Apple logo, it means your Mac couldn't find a valid System Folder to start up from.
Try reinstalling OS X by using recovery.
I don't think we can get on remotely. Is the PC stuck with the grey circle?
You will need to get one to recover the system folder. An Apple Store will be able to provide one too you.
It's only $15. If you rate me and close this out all will be accepted
Yes that disk should work
If you are happy please rate me on both posts