Mac desktops forum: IMac will not complete the start up process

by: Ocean525917 January 15, 2013 5:41 PM PST

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IMac will not complete the start up process

by Ocean525917 - 1/15/13 5:41 PM

I have an Intel 24" Imac (late 2008) that was giving me lots of problems although it worked fine if I used a second external monitor. Then one day it just stopped - it would restart only to go black and shut off. All searches indicated it was the power supply. Installed a new power supply and it still will not start completely. I did and extended hardware test and it failed to complete the extended test failing at the end with this error message: Apple Alert 4HDD/H/40000004=SATA(0,0) I tried booting in safe mode, nothing. I tried booting to Max OS and I get to the place where I choose HD or CD and I choose CD and after a short while nothing...white screen. If I just start the Imac normally it gets past the little gear only to just shut off and the screen black. Presently I have a white screen and the completer is locked up. Before all this the HD did work. Changed out the monitor last time also. Not much else---Any suggestions

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