EFI Grey Screen

Question

Hi,
I recently restarted my iMac and it no longer boots up. It gets stuck on the grey screen with a black loading bar along the bottom. The loading bar disappears and the spinner keeps turning but nothing happens.
When I hold down the 'option key' at the start-up to use boot camp it gives me the options of 'Windows' - which runs perfectly, or 'EFI' which takes me to the grey screen.
Can any body help??
Rgds,
Sam

Answer 1

That's not good. The EFI partition is normally hidden. EFI partition showing up as a boot option means that you have a hard drive problem. Start up from the install disk that came with your computer (insert disk and restart while holding down the "c" key) Click the forward button in the first window that appears, then click on utilities in the Apple menu. Select Disk Utility from the drop down menu. Your hard drive should appear in the sidebar of the window that comes up. It should show your OSX and your windows partitions. Select the OSX partition, then click "Repair permissions". After that completes click "Repair Disk". Let us know what happens with this process.