Hello, I have a Mac Pro 4,1 That I got off OfferUp, the owner claim he was trying to upgrade to 5,1 firmware. But he didn’t know he need to flash the firmware before upgrading the CPU. I have install back original CPU that come with the 4.1, the system will power up and get chime sound, but black screen. The system came with a Apple OEM nvidia Gt 120. I think I can hear the hard drive loading after the chime. I m not sure if there is OS installed on the drive. What can be the problem here ?
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MP 1,1-5,1 Black screen after chime sound
- Thread starter Micgo
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