a1312

Hi my A1312 will boot up and get to login in screen when I enter password the machine will just power off like power was turned off and then it will reboot to login screen and do the same again. I love the machine for video editing so would like to get it going again...any ideas Guys please!

I have a 27'' iMac 2009 model with Core i5-750,i know the cpu causally could upgraded to Core i7-860 2.8GHz(the Apple offered from the factory). I would like to know if it can be upgraded to the Xeon X3460 2.8GHz??The X3460 CPU has the same specifications as the i7-860,also could be seen as the...

I need to replace the logic board on an iMac and this is the specs of what I have iMac "Core i5" 2.66 27-Inch (Late 2009) 2.66 GHz Core i5 (I5-750) Intro. October 20, 2009 Disc. July 27, 2010 Order MB953LL/A Model A1312 (EMC 2374) Family Late 2009 ID iMac11,1...

I have a 2009 A1312 iMac I am trying to get fixed but I can't really figure out what the problem with the OS loading. I have tried multiple HDD's however all seem to get stuck at the apple logo with 75% loaded. I think the reason the fans are 100% are that there is no OS found and the LCD...