Mac Pro keeps stopping, lightweight CPU a / b overtemp on

I bought a used Apple Mac Pro 2.1 in December.  I use it mainly for editing my photos on Adobe PS, using filter of camera RAW.  The unit never gave me any problems, until early last week.  Here are the specs:

| 8-CORE 3.0Ghz (2 x Quad-Core)

| 32 GB OF RAM

| 250 GB SSD

| V RAM OF 4 GB GTX-680

| Double BONE - El Capitan (primary) and Yosemite on two separate boot disks.

All started early last week, with an error screen when I open an CR2 on Adobe PS file.  I got this message...

"Camera Raw has temporarily disabled acceleration graphics processor because of the error." Update your graphics card driver may solve the problem. "Choose the option 'Use the graphics processor' in the dialog box Camera Raw prefer to re - enable GPU support.

In 5 minutes, I when preferences and choose 'use the graphics processor', then continued my work.  Subsequently, the Mac suddenly stops without any warning whatsoever! No message, no noise from the tower itself, the power light remained.  I then turned off the power.  I waited for a minute and he went back on.  The password screen, it would be closed again.

I then let the rest of the machine for 30-45 minutes, removed any buildup of dust inside using compressed air and turned on the unit return to perform minor troubleshooting. as well as other "light work" to avoid an overload of the system... He will stop in 35 minutes to turn on the machine.

Still, I unplugged everything (including the power cord) to reinstall the two riser cards. I powered the Mac with the access panel open, to keep an eye on something unusual.  All fans are smooth running, no sign of problems.  Until I updated the driver (Nvidia Cuda) GPU, the machine will stop again in 10 minutes!  Frustrated, I opened the side panel to only discover, both red lights (CPU A / B) on the section of the overheating of the logic board.  After the recharge time, I restarted the MAC and ran a tempature monitor I have installed.  I noticed the radiator of the Northbridge turned very quickly when I was running Adobe PS, please refer to the picture I have attached.

I have no idea what to do next.  I'm not sure if I need a replacement PSU, or something else entirely.  Pointers, help and/or advice.  I greatly appreciate it!

Matt

Run Apple Hardware test

Using Apple Hardware Test - Apple Support

If you do not have the original installation disc with AHT you can download it here and make a bootable USB or optical disc

https://github.com/upekkha/AppleHardwareTest

https://gist.github.com/drewreece/2e5eed7dbfbd5dd7e929

Note that you need to download the specific to your model of Mac AHT.

Tags: Mac

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