HT3964 What can I do to fix my macbook pro when it's stuck on the startup screen, grey apple with spinning timer?

Please help!

The SMC Reset is for power related issues which you don't have.
The Gray Screen issue occurs if there is a incompatible or outdated third party at boot kernel extension file or if there is a corruption in one of the files of OS X itself.
You can bypass the kext files at boot by holding the Shift Key down while booting the machine, this will hopefully allow you to get in and backup users files off the machine first.
The best method to quickly fix Gray Screen issues is simply to #8 Reinstall Just OS X method, that way it kicks out any and all at boot kext files and gives a new copy of OS X itself, without touching most other programs or your files.
..Step by Step to fix your Mac
You will need to Software Update fully until clear afterwards to bring your security and Apple programs up to date, then evaluate which third party programs are no longer working (no at boot kext files) and seeing if there is a update for them that is compatible with your latest OS X verison before reinstalling them.

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LimitLess- wrote:
Hi,
I had the power supply connected when I attempted it previously but even so my problem occurred. My rom is different and so I still need to update it.
Thanks
I wanted to mark your answer helpful too but I didn't know that I could only put it for 2 answers. Sorry
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You can press the power button down to force a hardware shutdown, then reboot holding the shift key down on a wired or built in keyboard, this will disable them and you go around and update your third party software.
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HT3964 What can I do to fix my macbook pro when it's stuck on the startup screen, grey apple with spinning timer?

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