diagnostic leds

Hi All, this is my first post here though I’ve often arrived here when searching for troubleshooting answers. I have a Mac Pro 2008 (3,1) that I bought new for research originally. It lived it’s life doing day to day tasks while running simulations that took sometimes days in the background...

Hi, My Mac Pro 2,1 (upgraded from 1,1) decided not to fully boot up yesterday. It powers on but no chimes. The following Diagnosis LEDs light up on power up. LED 1 Trickle On (Yellow) LED 8 EFI (Green) All others are off. I've tried multiple reboots with the following. Swapped power...

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...

What can be wrong on a 4.1 tray? It's only on the CPU B side. It's not the CPU, swapped several times. It's not the memory, swapped as well. With another tray everything is fine. I know this tray has been sitting in a computer who ran hot, it killed the CPU B, replaced it, but something else is...

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...

Just did a 4,1 to 5,1 upgrade on my 2009 Mac Pro running 10.11.6 El Capitan. All is well EXCEPT that RAM slot 1 isn't recognized. Before: 2009 Mac Pro 4,1 2 x 2.26GHz quad-core After: 2009 Mac Pro 5,1 2 x 3.33GHx (x5680) hex-core Firmware update went fine. Both CPUs are recognized in...

I am running a Mac Pro 1,1 that was firmware upgraded to 2,1 and runs the latest version of El Capitan (10.11.6) thanks to Piker Alpha's modified boot.efi. The computer has an ATI Radeon HD 5750 video card with a modified ROM that makes it appear in the OS as a 5770. Boot screen is showing...

Guys, I have a problem with running the Apple Hardware Test. I am currently running a Mac Pro 2,1 (Mac Pro 1,1 with an upgraded firmware) with a passive-cooled ATI Radeon 5750 that was ROM-tweaked to appear as a 5770. Bootscreen is available. The machine is sweet. Many off these mods were...

I just recently acquired a Mid-2010 Mac Pro 5,1, and it is now having a major issue. When I initially got it (a few hours ago), it worked perfectly fine. However, after letting it sit awhile unattended (while I was in another room flashing an AMD Radeon HD 5870 graphics card I got for it), I...