If you have access to another Mac, it would be worth attempting to enter DFU mode on the Mac Pro. If it does not enter DFU mode, your only option may be to enlist the help of an Apple technician.
In some cases, Macs equipped with Apple silicon or the Apple T2 Security Chip may become unresponsive and require firmware recovery or restoration from another Mac. It seems that the Mac needs to exhibit some signs of power to successfully enter DFU mode.
Alternatively, you could try resetting the NVRAM, PRAM, and SMC. A situation like this can often resemble issues with a power supply, such as a blown fuse or tripped circuit breaker.
Unfortunately, I can’t afford to spend money on an hourly technician for unguaranteed results, especially considering the service charges that Apple typically imposes. I regret putting the W5700X on my credit card, but here we are.
I have generally had positive experiences purchasing items on eBay, but I never anticipated that even a non-functional card could cause my entire computer to fail. I contacted the seller, who indicated that he is not familiar with Macs; however, he offered a refund if we cannot resolve the issue, which still leaves me with a non-operational computer.
I genuinely appreciate your willingness to assist me. With the wealth of knowledge among the Mac community, I was hoping to connect with someone experienced in hardware repairs, particularly regarding power supplies for this model.
I’ve found power supplies priced between $99 and $150. If there is no fuse or breaker to reset, and if I could confirm that a replacement power supply has been tested and works, I might take the risk and purchase it.
Thank you once again for your help!
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