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- May 22, 2014
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I am working on a Mac Pro A1186 Quad Core that will not boot up to the OS. The computer will power on and I hear the start up chime, but nothing shows on the screen. I can hear the fans spinning and hard drive making noise, but still nothing displays. I checked the Caps Lock button light and it will not illuminate and when you press the power button on the desktop just once for a second the whole machine shuts off. I have reset the PRAM and this has not made a difference. It was working last night and the computer was not shutdown but did go into sleep mode and now this is happening. Any ideas? Thanks.