Please don't start removing drives or changing cables unless you know what you are doing and have exhausted other non-invasive alternatives outlined here. Note that the information I have provided is what Apple recommends, If other users suggest different solutions than found here, then be sure what they recommend does not impact on your warranty, if any, or ability to get continuing Apple service. The disk drive is physically non-functional - Replace the hard drive. Critical system files are damaged or deleted - Reinstall OS X.ĭ. Boot drive's directory has been corrupted - Repair with Disk Utility.Ĭ. Problems with the computer's PRAM - See Resetting your Mac's PRAM and NVRAM.ī. In most cases, the problems may be caused by one or more of these:Ī. Mac OS X- Gray screen appears during startup Solutions may be found in:Ī flashing question mark or globe appears when you start your Mac Their causes are outlined in Intel-based Mac- Startup sequence and error codes, symbols. These are related but not identical issues. Question (?) Mark, Blinking Folder, or Gray Screen at Startup Mac OS X- "Broken folder" icon, prohibitory sign, or kernel panic when computer starts Mac OS X- Gray screen or prohibitory sign appears during startup
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