I upgraded my 2010 Mac Pro with an RX 580 to make it Mojave compatible. I'd already upgraded the processor board to 3.46GHz 6-Core. I also bought a 500GB NVMe before I realised I couldn't boot from it, but with 10.14.1 I know that's fixed.
Just over a week ago my mac started behaving really strange. It would suddenly stop working, blank screens, keyboard and trackpad unresponsive. I think it was a kernel panic but I couldn't see it because of the RX 580 card.
I noticed my memory was being reported as only 16GB when I have 32GB installed. I could see in the memory panel of about this mac that 2 of my memory cards were missing. I removed all the memory and plugged it back in in the opposite order and went back up to 24GB but 1 piece of memory was still missing. The 3 that were working were all from crucial, the 1 causing problems was from HP with Samsung stickers.
I tried running AHT after putting an ATI5770 graphics card back in. With the memory still installed AHT wouldn't finish probing my machine. I noticed the memory also had a red LED next to it on the motherboard. AHT would run after I removed that 1 piece of memory but I got this error code:
Apple Diagnostics:
Last Run: 16/11/4018, 20:31
Version: 3A207
Test Suite: Quick Test
Result: Failed
Failure Code: 4SNS/1/40000001: VeBS-10.742
I searched online and the code seems to mean there is a sensor problem linked to voltage on the PCIe bus. I pulled all my cards from the bus apart from the graphics card and got the same error.
I did some more searching and found this post saying an NVRAM reset had fixed their problem with a very similar code:
https://discussions.apple.com/thread/5701587
I'm going to try that but wanted to post in case anyone knows what this error means. Also, any idea why the AHT thought it was in the year 4018?
Just over a week ago my mac started behaving really strange. It would suddenly stop working, blank screens, keyboard and trackpad unresponsive. I think it was a kernel panic but I couldn't see it because of the RX 580 card.
I noticed my memory was being reported as only 16GB when I have 32GB installed. I could see in the memory panel of about this mac that 2 of my memory cards were missing. I removed all the memory and plugged it back in in the opposite order and went back up to 24GB but 1 piece of memory was still missing. The 3 that were working were all from crucial, the 1 causing problems was from HP with Samsung stickers.
I tried running AHT after putting an ATI5770 graphics card back in. With the memory still installed AHT wouldn't finish probing my machine. I noticed the memory also had a red LED next to it on the motherboard. AHT would run after I removed that 1 piece of memory but I got this error code:
Apple Diagnostics:
Last Run: 16/11/4018, 20:31
Version: 3A207
Test Suite: Quick Test
Result: Failed
Failure Code: 4SNS/1/40000001: VeBS-10.742
I searched online and the code seems to mean there is a sensor problem linked to voltage on the PCIe bus. I pulled all my cards from the bus apart from the graphics card and got the same error.
I did some more searching and found this post saying an NVRAM reset had fixed their problem with a very similar code:
https://discussions.apple.com/thread/5701587
I'm going to try that but wanted to post in case anyone knows what this error means. Also, any idea why the AHT thought it was in the year 4018?
