horvazs Posted April 10, 2009 Share Posted April 10, 2009 Hi, I would need a little help. One day I had a weird idea to build mac pro from parts. No problem so far, slowly purchased everything needed, logic board, processors, memory, video card, case, psu, cables etc... so it is really a long story. However still today I was not brave enough to add all cost together, probably could have bought a retail mac pro, brand new for sure. Anyway which makes me sad now that after I put everything together it just doesn't start up. Does not give any signal. The only thing is when I press the diag_led button the 1st led (yellow) is on "standby" which means the trickle power is sufficient. But even if I press the power on button nothing happens, no more led lights on. (PSU I tested out of the case, at least in all connectors the 12 V is there) Any suggestion how I should test whether there is anything wrong with the PSU or the front panel board? Is there a way to temporally exclude the front panel in order to test whether that causes the failure? your comments are appreciated thank you Zsolt - Mac Pro Logic/Mother Board 2.8/3GHz 661-4449 - 2 pcs Intel Xeon E5462 2.8 GHz processors, L2 12 MB - Nvidia 8800GT - 4x 4GB=16GB DDR2 800Mhz RAM MacPro FBDIMM - mac pro 980W PSU 614-0383 Link to comment https://www.insanelymac.com/forum/topic/161470-newly-built-mac-pro-does-not-start-up/ Share on other sites More sharing options...
zhell Posted April 10, 2009 Share Posted April 10, 2009 (PSU I tested out of the case, at least in all connectors the 12 V is there)Any suggestion how I should test whether there is anything wrong with the PSU or the front panel board? Is there a way to temporally exclude the front panel in order to test whether that causes the failure? I really hope you will get that to work, and you are right, better not to compute the overall expenses, at least not as long as it doesn't boot... Regarding the PSU: I had a PC with the same symptom exactly, except that the light on the mobo was even green... I did not check the voltages, but clearly one of the MANY rails must have been dead as when I replaced the PSU, all went fine. So I would suggest to test at least the connector that goes to the mobo for all voltages, especially the lower ones. Surely you can find specs on that, otherwise assume it's something ATX-like and get that spec from wikipedia. To test the front panel, you could maybe unplug it from the mobo and check if any of its cables are shorted when you press the button (this is what one would do with a PC, at least). Good luck! Link to comment https://www.insanelymac.com/forum/topic/161470-newly-built-mac-pro-does-not-start-up/#findComment-1129520 Share on other sites More sharing options...
horvazs Posted April 14, 2009 Author Share Posted April 14, 2009 I just figured it out that there is sg wrong with the PS#2 connector pinout of my PSU. That is not really one which is for my logic board. Probably Apple made some modification in the newer version. Changed the wireing (grnd/+12V) Would someone give me information about the PS#2 connector pinout of 614-0409 PSU? very much appreciated Zsolt Link to comment https://www.insanelymac.com/forum/topic/161470-newly-built-mac-pro-does-not-start-up/#findComment-1132327 Share on other sites More sharing options...
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