I have a D510mo which shut down abruptly yesterday. Rebooted fine, but shut down again today and now refuses to post. Powering the board lights the green light on the board beside the CPU. On/Off switch spins up the HDD and HDD fan, but there's zero video out (and attempting to connect to the machine via ssh gets no connection). Things I've tried so far: remove all peripherals; remove all ram (I don't have any spare, just want to see if I can get to post/bios); remove cmos battery, wait 30 mins and replace with a new battery; download current .BIO file, put it on a completely blank usb key, disconnect power from D510mo, remove bios jumper (ie put into recovery mode), put key in usb slot, reconnect power, switch machine on. Nothing. The usb key I'm using has a light which flickers when read operations are going on, but nothing happens here. Finally, I've tried booting with the bios jumper in configureation mode as well as recovery mode and normal mode.
Any suggestions, or is the board fried?
Thanks in advance
With the PSU molex connector plugged into the board and the board 'on', all voltages are spot on (3.3v, 5v, or 12v) with the sole exception of pin 15, which is reading -10.5v instead of -12v. Unfortunately I don't have another PSU to hand, but I can definitely get one if that -12v line is likely to be causing the problem.
It does not seem like much , But the 12 line can not be more than 0.5 Volts from 12 Volts , This can effect Chipset CPU and alot of other things , Thats why I stick with a PSU that has active power control Gold Cert. But thats me the machines I Build are about $2000.00 So I am real picky about what parts I use , as far as a PSU SeaSonic is one of the best , It's your choice.
I bought a brand new PSU today, but no success. The light beside the CPU on the motherboard still lights up, HDD & fan still spin up when the power switch is turned on, but nothing further. Voltages coming into the board are all within 0.05 of expected, with the exception of the negative 12v line, pin 15, which shows negative 10.5v. I think your point that having a voltage well outside parameters indicates something funky is going on is spot on, but it looks like it isn't the PSU itself in this case..
The motherboard has a standard 24 pin molex female socket that the wiring harness from the PSU plus into. The standard 24 pin ATX 12 volt 2.0 standard labels the pins 1 through 24 (see the image about halfway down this page: http://en.wikipedia.org/wiki/Molex_connector). When you turn the D510mo over and look at where the power connector is soldered to the board, the pad for pin 1 is square and all the rest are circular. I'm measuring the voltages by poweing the board up, turning it over, putting the ground probe from my multimeter on pin 18, and putting the positive probe on whatever other pin I'm trying to measure. Pin 15 (using the labeling nomenclature in the diagram on wikipedia) is the negative 12v line.