why does my mac pro not transmit boot sound and image?

Bruno Mazalo

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Oct 15, 2021
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Hello everybody. i have two mac pros one is from 2009 and the other from 2010 and both have the same problem. they have been standing for a long time and now i intend to use them again. one of them has the 1gb ATI Radeon 5770 graphics card and the other has two original apple graphics cards of each 1gb. the problem: when I turn both on, a red light flashes on the motherboard, the graphics cards turn on but I don't have an image on the monitor and also don't hear the common boot sound of macs. I tried various forms of cables and adapters on the outputs of the graphics, judging me that they were the graphics, I've done maintenance on the thermal pastes on the processors, I tried several ram memories but it's still the same. for me, who is not or technician, i have tried what i could and i dont know what else to do. Could someone help me solve this problem? I'm desperate and I wouldn't want to trash my mac pros. Thanks
 

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