I'm getting a folder with a "?" when trying to boot up. Solutions?

[audirs5]

I keep getting a folder with "?". I see online that its because my laptop can't detect my boot up disk. Can anyone suggest a solution, but also, any reason this happened now? It's never occurred before.

Thank You

 

[LlamaLarry]

Have you checked your drive/partitions using Disk Utility while booting in Recovery mode?

 

[audirs5]

Have you checked your drive/partitions using Disk Utility while booting in Recovery mode?

No idea how

 

[glenthompson]

If you don’t know how to do this maybe you shouldn’t be running a beta Operating system.
Cmd-R when you boot to get into recovery.

 

[matram]

Try running a HW test to rule out HW failure

And then file system diagnostics / repair to ensure that the data structure on disk are OK.

With disk utility or command line tools you can check which partitions exists, if they are bootable and if they are mounted. You can also try to manually mount disks which may give you more error information. Any disk has to be mounted before you can access files on it, i.e. to boot.

This is all fairly advanced stuff and if you do not understand what we are saying you may be better of taking the computer to someone that can help you.