Apple PC keeps restarting

I have a Apple Mac Computer Model A1225.
That keeps restarting before it comes to the login screen. I've put the hard drive into another Mac and the same thing happens, the computer starts in safe mode quite well though..

Any help will be greatly appreciated
Clint CozynsenOwner/ManagerAsked:
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Qian BaoConnect With a Mentor Digital Media Specialist and Web DesignerCommented:
Is the Mac able to login eventually after multiple restarts? There's definitely something wrong with the operating system on the hard drive. What you can do is to download the newest OS, or at least reinstall your current OS. I recommend you to do this through macOS Recovery, accessible by pressing Command (⌘) – R when booting up the Mac. Choose Reinstall OS to install the operating system. This will not wipe out your disk, it will just patch up the system with what they have originally. You will need Internet access to download the OS in Recovery.

***Always. Always back up your files before doing anything!***
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Clint CozynsenOwner/ManagerAuthor Commented:
Alright, ill try that. Thank you

btw, have you any idea on how this may have happened in the first place
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Qian BaoDigital Media Specialist and Web DesignerCommented:
Did you installed any software recently? Try to recall any recent installations or hardware upgrade to the Mac.
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Gerwin Jansen, EE MVETopic Advisor Commented:
Before you reinstall - did you try to reset PRAM:

https://support.apple.com/en-us/HT204063
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Clint CozynsenOwner/ManagerAuthor Commented:
no i have not done that,
ill have a look on how to perform that
Thank you
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Gerwin Jansen, EE MVETopic Advisor Commented:
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Clint CozynsenOwner/ManagerAuthor Commented:
tried that, and mac still restarts. looks like its a reinstall
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Clint CozynsenOwner/ManagerAuthor Commented:
Load bar gets to about half then it restarts.
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Clint CozynsenOwner/ManagerAuthor Commented:
Thank you guys for your assistance
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Gerwin Jansen, EE MVETopic Advisor Commented:
No problem, reinstall is what I would try next (see first post). Good luck!
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serialbandCommented:
The A1225 is a Core 2 Duo iMac.  Do you have the original installer disc?  Command r probably won't work for you.

Have you tried booting into single user mode to run fsck -fy?
Have you tried running disk repair and permission repair with Disk Utility when you boot into Safe Mode?
I would try those first before reinstalling.

If it starts in safe mode, then you have a driver issue.  You could try checking the log file while in safe mode to see what errors pop up during startup.  You might possibly discover what error is showing up.
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