Two months in the past I used to be given away a Mac Professional 1,1 (A1186), in good working situation. Some days later, I had the brilliant concept of testing a working PCI specific video card I faraway from a PC on my Mac, but it surely didn’t activate. So I eliminated the video card, reinstalled the outdated one, and once more, it didn’t activate. I eliminated the 3V battery to reset the PRAM, changed it with a brand new one, carried out a SMC reset, and tried all the things I learn on the boards, with no luck. I checked the logic board standing LED’s and I observed all of them remained off. Suspecting the offender was the PSU, I ordered a second-hand PSU on eBay (Delta DPS-980AB A), I put in it yesterday however my Mac nonetheless doesn’t activate. No standing lights, no clicking sound, no spinning followers. I checked all of the connectors once more. I examined it by unplugging connector # 4 and shorting ‘PS_ON’ plug and floor along with a paper clip. The PSU switches on, all of the followers begin spinning, all of the led’s on the RAM raiser gentle up, however the logic board LED’s don’t gentle up, the switch-on button doesn’t reply and as quickly as I take away the paper clip, the PSU switches off. Conclusion: the “new” PSU works wonderful, so does the outdated PSU (I examined the voltages on each of them), and my logic board is toasted, I’m afraid. Is there any “miraculous” process to revive my Mac, or I’ve to purchase a second-hand logic board?
