I think I made a mess of things this morning, so I am turning to forum for help I deleted a partition on my Mac computer and then tried to get a copy of Mavericks OS X on a USB (done through TransMac). That was done perfectly and I wanted to do a system restore through USB stick. When it was done, I am getting a grey screen with a black stop sign. I tried to repeat the process but the result is the same. What might I be possible doing wrong?
Check this link
It have various solutions, so try the best one for you