Hi guys, my Macmini4,1 @ 2.40 GHz (x 2), 2048 MB RAM failed to load the OS and right after I started to reinstall the OS again with original DVD it all went fine, but after a few attempt to update my OS IT FAILED to update and i try few times until my os stop responding and which i did try to reinstall the OS in which I have failed to do so. things I have done so far: 1.PRAM done! 2.Apple Hardware Test done! (at first I had difficulties to finish the test but after a few attempts it was no issue in hardware) 3.pull the plug out and also memory ram and left it for a while with no connection and electricity 4.I have try to create image file of my hard drive in disk utilities but failed due to few factors (file is too big, input/output error) so I haven't be able to back up my data, is there any format I have to use to back up my data? 5.erase unused space with disk utilities 6.verify and repair hard disk few times until there was no issue at all 7.verify and repair permission for the Macintosh HD I have also attached my installer log report for more information. Please check the log report, as I have no clue whatsoever with this report after reading it for a few times.