Dear MacRumors users,
I often found answers to problems on this forum as a passive observer but this time I'm stuck which is the reason for my first post. I hope I'm in the right section, here.
Yesterday my Mac Pro refused to boot. I hear the gong and see the apple but then it just turns black. I tried to boot from the original Leopard DVD and a Mountain Lion USB drive. Both didn't work. I'm not even able to enter the bootmanager. I tried an SMC and PRAM reset and startup in safe mode with no success.
I tested the HD on another computer and it's running fine.
The Mac is originally a 2009 Quad Core but I upraged the Firmware to 5.1
and upgraded the CPU to a six core Intel Xeon X5675
upgraded RAM with 3x 16 GB Samsung DDR3 PC3 ECC running at 1066
Gforce Zotac GTX 470
running Mountain Lion
So a lot of potential for trouble, I guess...
I disconnected the DVD drive, any externatl devices, all internal HDs and put the original GPU (GT 120) back in to minimize error sources.
The video output is quite distorted. The grey bootscreen appears to be yellow and the apple logo has a lot of pixel errors.
I noticed a buzz coming from the PSU that I never heard before. It also buzzes if the Mac is turned off. Tried a different cable but it still buzzes.
Anyone has any suggestions or is familiar with the issue? In case the PSU is broken, can it harm any other parts of the Mac? Is there a possibility to perform a hardare test remotely through fire wire target mode or something like it?
Hope to hear from you.
Thanks in advance, Juse
I often found answers to problems on this forum as a passive observer but this time I'm stuck which is the reason for my first post. I hope I'm in the right section, here.
Yesterday my Mac Pro refused to boot. I hear the gong and see the apple but then it just turns black. I tried to boot from the original Leopard DVD and a Mountain Lion USB drive. Both didn't work. I'm not even able to enter the bootmanager. I tried an SMC and PRAM reset and startup in safe mode with no success.
I tested the HD on another computer and it's running fine.
The Mac is originally a 2009 Quad Core but I upraged the Firmware to 5.1
and upgraded the CPU to a six core Intel Xeon X5675
upgraded RAM with 3x 16 GB Samsung DDR3 PC3 ECC running at 1066
Gforce Zotac GTX 470
running Mountain Lion
So a lot of potential for trouble, I guess...
I disconnected the DVD drive, any externatl devices, all internal HDs and put the original GPU (GT 120) back in to minimize error sources.
The video output is quite distorted. The grey bootscreen appears to be yellow and the apple logo has a lot of pixel errors.
I noticed a buzz coming from the PSU that I never heard before. It also buzzes if the Mac is turned off. Tried a different cable but it still buzzes.
Anyone has any suggestions or is familiar with the issue? In case the PSU is broken, can it harm any other parts of the Mac? Is there a possibility to perform a hardare test remotely through fire wire target mode or something like it?
Hope to hear from you.
Thanks in advance, Juse