Two months prior, I had received a Mac Pro 1,1 (A1186) as a gift, in exceptional working condition. Several days passed before I conceived the bold idea of attempting to boot up a functioning PCI graphics card on my MacBook from a distance, but unfortunately, it failed to initialize.
After attempting to troubleshoot by removing and reinstalling the original video card, I was still unable to activate it. Without success, I removed the old 3V battery to force a Power Management Unit (PRAM) reset, replaced it with a fresh unit, performed a System Management Controller (SMC) reset, and exhaustively applied all troubleshooting techniques gleaned from online forums, yet persisted without achieving the desired outcome. The standing LED’s on the logic board showed a consistent pattern of darkness as I conducted my inspection.
After ruling out the primary power supply unit as the culprit, I decided to procure a replacement PSU from an online marketplace, acquiring a refurbished Delta DPS-980AB A unit, which I installed yesterday; unfortunately, my Mac still fails to boot. No flashing lights, no audible clicks, nor whirring mechanisms. I scrutinized each connector carefully to ensure their integrity. After re-examining the board, I verified the functionality by isolating connector #4 and creating a temporary connection between the ‘PS_ON’ pin and the ground plane using a paper clip. The power supply unit powers on, initiating a cascade of motion as all followers begin spinning simultaneously. The RAM raiser’s LED indicators softly illuminate, while the logic board LEDs remain dark, unresponsive to the switch-on button’s prompt. As soon as I remove the obstructing paper clip, the PSU promptly shuts down, its functions ceasing in an instant.
It appears that the new power supply unit (PSU) performs exceptionally well, mirroring the quality of the original unit, which I thoroughly tested by examining voltage levels on both. Unfortunately, my logic board has suffered significant damage.
Are you desperate for a revival of your MacBook’s performance, wondering if there’s a magic fix to breathe new life into it, or must you resort to purchasing a refurbished logic board and potentially encountering unknown compatibility issues?
