MacBook Pro 3.1 boots up freezes then shuts down before sign in screen

I recently upgraded to Yosemite from Mavericks and now my MacBook Pro 3.1 when Iturned on takes me to my login screen (sometimes other times even before the login screen) freezes up, I can't make the mouse cursor move and keyboard does not function then it shuts down and reboots over and over again

A 3.1 MBP is a 2007 15" MBP. You indicate that you have a retina MBP. Clarification would be helpful.
Try SMC and NVRAM resets:
http://support.apple.com/en-us/HT201295
http://support.apple.com/en-us/HT204063
Then try a safe boot:
http://support.apple.com/en-us/HT201262
Any change?
Ciao.

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Replaced Logic Board, RAM, and hard drive connecting wire, but Macbook Pro 15' (Mid 2010) now freezes and shuts down randomly

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Try the other suggestions here:
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turn off the mac completely
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Reinstalling OS X Without Erasing the Drive
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Hi,
I have a MacBook Pro running Snow Leopard v 10.6.8 and have put on all the security updates.
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Hi Allan,
Thanks for your reply.
I have been closing iCleanMemory but the shut down (kernel panic) was still happening. Not sure how to go about uninstalling it as it's one that runs at start-up and dragging it to the trash might not get rid of it completely. I"ll find it's web site and see if they have any info.
Haven't checked your web link yet (it's late and gotta get to bed) but will do so tomorrow.
I also run Backblaze and DropBox that begin at startup and are constantly updating in the background, iStatMenus and Sharpshooter.
The kernel panics were happening....tho much less frequently.....before i put iClean Memory on. If I remember right, I installed it just because I had those periodic shut downs and wondered if it was a lack of memory. Because I then saw that memory was very low all the time, I decided I must need to put more memory in. And that seems to have made the issue worse while also making the machine work faster for the time it is running.
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MacBook Pro (15-inch, Mid 2009) and later
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