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few weeks ago, my brother told me his imac 24" would not switch on.
First thing i did was calling the nearest apple repairshop and the told me pieces for this computer wasn't enable anymore as it was vintage. My brtother was ready to buy a new one when i thougt of Ifixit and searched for a power supply (who was obviously the problem).
i bought the power supply on the fixit shop and 2days later it was at my door (really great service) it took me 3 hours to open, repair and close the Computer as i had fear to break the glass panel but it went well. and then ! TADAAAA ! i clicked the power button and the apple showed up on the screen. it was a victory and it costed me less than 200€ Thanks a lot Ifixit !
to change the power supply, use the tuto for hard drive change , label the box where you put screws and don't remove screws from the aluminum part on the motherboard, that's useless and one of my mistakes who took some times.
Finally, don't FORGET to RECONNECT the screen before reassembling... i had to do it all again.
Everyday I would come into the office and the Mac would not start. But everytime I packed it up and took it to apple they would not find a problem.
Bad PSU. Part arrived at 2:20Pm. I had the Imac open and ready and the old part removed. Popped it in and put it back together and it started right up. I am very pleased.
Don't rush off to the repair shop. Post your problem in the ifixit forums and let many heads give you advice. Better than just one head anyway.
the imac stop working, seems totally dead
frist I found that the fuse on power supply was blow, and the diode bridge was in short cictuit. so I decided to replace the power supply because was 5 years old and because I can't find schematic on the web. replacing power supply I found that the system turn on, but the display remain black. using the apple technician guide I followed step by step and I found a good trick: illuminating the front of display by a lamp (I used the LED of my phone) I found that the display was working! just the backlight was off. so I found the pinout of the display (LG LM240WU2-SLB4) and checked if the voltage coming by the power supply was ok. the voltage was ok, so I removed the inverter placed on the back of display. I found that the SMD fuse was blowed. before replacing the fuse I checked if the mosfets (AO4614B) was in short circuit. mosfet seems ok, so I replaced the fuse and the display start to work! hope could be useful, sorry for my english :)
check documentation before start
Multiple problems, including a corrupted hard drive and blown capacitors on the power supply, likely due to lightning strikes.
Great following the iFixit guides, including the power supply instructions. The help for reattaching the monitor cable by undoing the power supply, connecting the monitor, THEN re-attaching the power supply made things orders of magnitudes easer. Booted up first time after the PS & HDD replacement like a charm. Had to install Yosemite via USB drive.
I had previously bought several of your tools including the glass suction cups, the torx socket set and spudgers, so repairs were a breeze having the right tools for the job!
Add in instructions/pictures for how to tell if the power supply is bad. In my case, 3 of the capacitors were not leaking but were simply bulging, from what i was reading on the internet that means they have failed and no longer supplying power properly. Booting without the cover confirmed this as the 4leds in the lower right corner, lit up #1, boot-up chime, 2-4 lit in sequence, screen flickered, then all went dark, including #1 led. So at that point I knew the PS was toast.