My Mac Pro shuts off after entering my log in information

My mac pro shuts off when my log in information is entered after about thirty seconds or so.

Hello again,
it seems I have solved the problem myself. In system preferences, Security and Privacy, General, I deselected Ask for a password after … minutes …. Now the computer goes to standby normally, and of course does not ask for a password any more after waking. I still do not understand why choosing this option should make putting into standby impossible.
I hope this finding can be of service to other users.
Goodbye.

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Migg7 wrote:
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WHY DOES MY MAC BOOK PRO SHUT OFF ON ME? SO FAR THE INFO I GOT 4 IT IS A MAC OS X VERSION 10.7.3 THE PROCESSOR IS 2.4 GHZ INTEL CORE 2 DUO MEMORY IS 2 GB 667MHZ DDR2 SDRAM I DON'T KNOW HOW OLD IT IS BECAUSE I BOUGHT IT USED SORRY I HOPE THIS HELPS THANK Y

WHY DOES MY MAC BOOK PRO SHUT OFF ON ME? SO FAR THE INFO I GOT 4 IT IS A MAC OS X VERSION 10.7.3 THE PROCESSOR IS 2.4 GHZ INTEL CORE 2 DUO MEMORY IS 2 GB 667MHZ DDR2 SDRAM I DON'T KNOW HOW OLD IT IS BECAUSE I BOUGHT IT USED SORRY I HOPE THIS HELPS THANK YOU

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Also see:
Reinstall OS X Without Erasing the Drive
Choose the version you have installed now:
OS X Yosemite- Reinstall OS X
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