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psu

  1. LegacyCore

    Mid 2011 21.5-inch PSU

    I have a mid 2011 21.5-inch iMac that I’ve upgraded to 32GB DDR3 pc1333 memory, 512GB Samsung Pro 860 SSD, nVidia GTX 770m 3GB GPU from a Dell Alienware gaming laptop with A1312 three pipe GPU heat sink, and Intel Core i7-2600a quad core CPU. (Before people ask why didn’t I just buy a 27” with...
  2. BronzeLight

    I think my PowerMac G4's PSU died, what should I replace it with in 2021?

    Hello, this is my first post. I have used these forums for reference many times and some of the pages here are very helpful! I have a problem with a Digital Audio PowerMac G4 that I recently acquired. From other threads I've looked at it sounds like my power supply died. Symptoms and other...
  3. C

    PSU style for Late-2015 iMac

    I have a shorted 27" Late-2015 iMac, thanks to a duff USB dvd-drive, I'm seeking a replacement PSU. There are multiple 'styles' of 300W A1419 PSU from 2010-2015, which are similar at least in form factor, but I don't know if they're all compatible? Technically I think I have a MK462LL/A imac...
  4. mohammad.golche

    imac 2011 27" power supply problems

    i have an imac 2011 27" , imac PSU was making the electrical buzzing noise. i replaced it with another PSU . now imac is silent but cpu fan is running at max rpm speed (4200). i checked HWMonitor temperatures and PSU temperature was 130 c , but PSU is not hot. please help me... where is...
  5. M

    MP 1,1-5,1 Help diagnosing hardware issue

    Hello. When I switched my Mac on this morning, it worked for a short while, then the screen displayed some small squiggly black lines all of a sudden. I could move the cursor for a few seconds after this, then everything crashed. I held the power button to power off and tried to switch back on...
  6. TrumanLA

    MP 1,1-5,1 MacPro 4,1 / 5,1 Adequate Wattage / Wiring: 980 Ti or 1080 Ti GPU

    SOLVED via 'Pisla's Mod" It doesn't appear as difficult as it looked at first glance: It consists of using simple taps on 8 long wires, which are routed from the DVD area through the HDD shelf, to the GPU. I'll post any extra details or pictures after I do it ... as I'm sure I"ll find areas...
  7. kirkbross

    Macbook died?

    My 2017 Macbook died. I think. The screen glitched and then it went dark. No pulse. I've run into vid card and PSU issues on my Mac Pro and PC so I'm thinking it's probably one of those. I've never tried to replace parts on a laptop, and frankly, I would almost rather buy a new laptop. Thoughts?
  8. O

    iMac not powering up after upgrade (RAM, SSD, CPU thermal transfer)

    I did a few upgrades to a 2017 21.5" Retina iMac, and unfortunately, upon reassembly, it isn't powering on. Here's a photo of it, display disconnected. In the second photo I've labelled things for reference. Status: In the photo, AC is plugged in Of the 5 diagnostic lights, the first one...
  9. Q

    MP 1,1-5,1 SOLVED: 2010 5,1 cMP won't boot. Backplane or PSU?

    Sorry to make my first post one asking for help... I have a 2010 Mac Pro which won't boot and I suspect either the PSU or the Backplane has failed. The symptom is that adding a power cord and pressing the power button does nothing. No noise, no clicks, no lights: nothing. I have followed the...
  10. T

    17" iMac Won't Boot

    iMac 17” 2 GHz A1208 does not boot, no chime, no fans or other mechanical activity. Opened it up to see the diagnostic LEDs. Upon plugging in, LED 1 lights up normally, and LED 2 lights up at about half brightness and before I touch the power button. I have not been able to find any...
  11. orph

    MP 1,1-5,1 What is safe PSU temps cmp5,1

    Hay in the UK & we have a small heat wave, iv seen my PSU sensor 2 hit 67c+ at default settings. After that iv set the PSU fan to keep the PSU sensor 2 under 50c but at 1400-2000RPM it’s a real pain. 2000RPM and still 49c on PSU sensor 2 ! So is it safe to let it get that hot? Anything I can do...
  12. M

    MP 1,1-5,1 PowerSupply Question

    Hello, My MacPro 5,1 power-supply is making a buzzing sound. I have already tried cleaning it out, but the sound still comes and goes. I'm thinking of buying another power supply to have a backup as I use my system for work. The model on my PSU is dps-980bb-2. While online I did see some units...
  13. N

    MP 1,1-5,1 PSU & Fan Sounds on 2012 Mac Pro 5,1

    Hi there, I wondered if someone could help to clarify if the sounds in the following video were normal or potentially a sign of something wrong (headphones recommended): https://bit.ly/2FJLMij The PSU is making a fizzing sound up close. The fan is also emitting a low whirring sound that is...
  14. donluca

    MP 1,1-5,1 Is it time to give our cMP's PSU a recap?

    I've read several reports of people having their PSUs dying, so I was wondering, since those Mac Pros are at least 10 years old, if it's finally time to get our hands dirty by opening the PSU, warming our soldering irons and give the thing some love with new shiny capacitors. Recapping is a...
  15. G

    MPc 4.1 2009, PSU Blows fuses in house

    I have one 2009 4.1 MPc. UPDATED: Machine keeps blowing fuses upon plugging it into socket for power. Once one fuse is blown (or fuse is blown one time) the machine runs just fine. I now did have another look at the problem, and seems that the fuse will blow when cable is put in FIRST time...
  16. error2507

    AcBel 600 Watt compatible with PowerMac G5?

    In my previous post some people said that I should change the PSU from my PowerMac G5. My question: Is the AcBel 600 Watt PSU compatible with it? I am new to PowerMacs #12 My serial number is CK422H6MR5J . I looked it up on everymac.com and it says A1047 (EMC 1969) is my model name.
  17. cs.oyen

    MP 1,1-5,1 [Mac Pro 1,1] PSU test?

    Hi guys! I have here an cMP, a 1,1 - 2006 (flashed to a 2,1) Mac Pro. Two days ago I left it powered on and a few hours later when I take back to work it's already off and since that moment can't made it powering on again. No signal. No error leds, no sound, absolutely nothing. Already...
  18. parisinvest

    Mac Pro 1,1 won't start after upgrade to 2,1

    hi you all, share an experience of upgrading mac pro 1,1 to 2,1, after update the firmware normally, the Mac won't start, the power button remains light on, some click inside of case, hear the video card has noise and then silence, then restart noise in cycle, nothing on screen, no chime at...
  19. parisinvest

    Mac Pro 1,1 won't start after upgrade to 2,1

    hi you all, share an experience of upgrading mac pro 1,1 to 2,1, after update the firmware normally, the Mac won't start, the power button remains light on, some click inside of case, hear the video card have noise and then silence, then restart noise in cycle, nothing on screen, no chime at...
  20. Ishfaq.rubab

    Mac Pro Diag_LED indications

    I have a dual core early 2009 Mac pro.. I was working just fine till one day it just died over me. After tons of research I figured it was the PSU as the diagnostic LEDs were dead aswell so I gave the PSU to this mechanic I knew and he sort of fixed the issue (I Think) cause after the repair the...