In this model the power-on pads located on the upper side of the motherboard, on the right side from the screw mounting hole. MacBook Pro (13-inch, Mid 2012) Here’s a shot of the MacBook Pro 13″ Mid 2012 logic board power on pads. These pads are located to the left of the memory slots and above a silk screened “HF/e1” on the logic board. MacBook Pro (13-inch, Mid 2012) Here’s a shot of the MacBook Pro 13″ Mid 2012 logic board power on pads. These pads are located to the left of the memory slots and above a silk screened “HF/e1” on the logic board. The power-on pads are shiny, silver, square, and larger than the other (mostly round) silver pads nearby. Same problem with my Power Mac G5 2GHz Dual: It would power up, but wouldn't boot up, no boot chime, no image on the monitor, no power to keyboard/mouse, and after a minute the fans went crazy. Nothing I tried helped: Complete disassembly & cleaning (filthy with dust), check/reseat RAM modules, check/reseat graphics card, replace PRAM battery, reset CMU, etc. So, I removed the 'B' drive, where I keep all my music, and connected it to another computer so I could listen to some songs, but it wouldn't recognize it. So, I thought the hard drive was bad. Then one day for the!&&* of it I pressed the power button on the dead G5 to see what would happen.AND IT BOOTED UP AND WORKED FINE. I put the 'B' drive back in, connected it, and clicked 'RESTART', but once again it wouldn't boot up. On a friend's tip, I disconnected the cables to the 'B' drive, and the G5 powered up, booted up, and ran fine! After searching the internet for days I did finally try what I thought was an unlikely cause to this problem -- I changed out the video card. This solved the problem. My specific problem was that when I pressed the power button the light was lit (no red diagnostic lights on the logic board) but after a brief spinning sound there was no startup chime and there was silence until the fans started up full blast. I had been using the computer and it suddenly turned itself off and I was never able to restart it until I replaced the video card. If you want to test to see if this might be your problem -- before you spend money on a video card -- take the video card out of your machine and press the startup button. If you get the normal powering up sounds with normal fan noise it is likely the video card. Download itunes 9.2.1 for mac. I had read this solution in one or more posts to this issue, but I couldn't see how that would work so passed over trying it in favor of other possible causes. I am posting this so others will take note that this is good advice even if it seems unlikely. Give me an EMC #. It's located at the bottom of the door. What is your current RAM configuration (this is critical) how much and in what slots? Have you changed the battery? Do you have a volt meter? We may be testing the power supply output later without tearing into anything. You don't want to replace the power supply because you don't have the CPU synchronizing software that is on the Apple Service Disk (ASD) that only authorized service providers have. I've been trying unsuccessfully to get one for two years. Without this the fans run wild when the power supply is replaced. I own this machine and just put a new video card in it today. ![]() So I'm familiar with it. UPDATE The fan syncing software is on the original system installation disks. On my old G5 2Ghz, I had the same problem. The solution (for me) -> plug a VGA monitor with DVI adapter to the graphic card, and it boot when I plug the cable.
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