Macintosh Laptops

When I turn on my MacBook I get a white screen with a flashing folder with a question mark. Can anybody help?

I've tried restarting etc as well as holding the on button while starting up. I really have no idea what's happening.

Maybe it means a corrupt hard drive, maybe not.

It simply means the computer cannot find an operating system. Several possible causes:

* NVRAM is corrupt (solution: reset it)
* Hard drive has data corruption (always repairable, but could involve data loss).
* Basic system files / folders are renamed, moved, corrupted, or missing (solution: name them back, move them back, or reinstall OS X).
* Hard drive not properly installed (missing or disconnected or bad cable).
* Hard drive has mechanical or electrical problems (usually not repairable; must replace the drive)

Since it is hard to know which of these is the cause of your flashing "?", start with the easiest solution and work up to the drastic ones.

Reset NVRAM by holding four keys during startup: command - option - P - R. Hold these keys until the screen goes off and on twice, or you hear the startup chime music tone twice. Don't over do it. In this case, more is not better -- two flashes or chines is the perfect number, five is too many.

Put the OS X install disc in the DVD drive, restart and hold option key until you see the Startup Manager screen. Click on the DVD icon, press return. At the installer screen, open Disk Utility from one of the menus. Click on the First Aid tab. Is the hard drive icon shown at the left? Good. Choose to repair the hard drive. If problems show up, hope they can be repaired. If the problems can't be repaired, you will need to buy another Mac drive utility disc and hope it can repair the drive or erase the drive (all your data will be lost). If no problems show up, reinstall OS X or do "Archive install preserving Users and network".

If no hard drive icon shows in Disk Utility, quit, shutdown. Open the case and reseat (unplug -- plug back in) the connections to the hard drive. Reset NVRAM again. If you still have the flashing "?", boot to the install disc again, open Disk Utility again. If you have a hard drive icon, try to repair the hard drive or reinstall. If no hard drive icon, buy a new hard drive.

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