Try Re-seat the RAM if you didn't already. Actually, re-seat everything. I unplug/disconnect everything. Then, connect only the absolute bare minimum to run. If that doesn't work, I start swapping out components until I find the problem. If still no problem, it is something soldered to the MB that went bad. Unless, it is the BIOS settings, but I doubt it (did you change anything in there?).
I did it already. In addition, I cleared the BIOS/UEFI settings. I'm pretty sure that it is something wrong with the motherboard.
hi,
plug just atx power/memory/processor/cooler(even processor may resist some seconds without but maybe mobo shuts down if not seeing pulses from cooling processor's fan)
and course reset cmos before that
courage!
That is the exact setup I had in the video in my initial post except that P4 connector was also connected.
What is that crap between of RAM chips? Inspect pins on CPU socket with some sort of magnifier.
It was dust. I removed it with compressed air. I did inspect pins on CPU socket using a magnifier and very good light conditions, but they seem to be perfectly fine.
Rasz,
lordvader88,
I came to same conclusion when I connected
PSU 24-pin ATX12V 2.x connector to my known working MSI H81M-P33 motherboard, shorted PS_ON with ground and the PSU LED stayed green and PSU stayed working. When I did exactly the same with this problematic
Asus B85M-G motherboard(as seen on the image, I also replaced the possibly faulty capacitor above the PCI-e slot), then the PSU started power-cycling as seen the video in my first post. I tried to measure voltages, but those did not seem to be abnormal. On the other hand, maybe my DMM simply didn't detect the reading fast enough. So I also guess that this is either a
PSU over-current or short circuit protection.
Do u have a DMM and/or oscilloscope ?
I do have a DMM. I don't have oscilloscope, but I could buy one if it helps troubleshooting.
get a dmm and measure all the power rails in diode mode on the unplugged board
Is there a way to know if voltage drop value or open line is normal or not when I don't have an exactly the same board for comparison or schematic with those values? In addition, there are overwhelming number of points to measure.. I mean I could put the red probe into ground in diode mode, but where should I connect the black one?
What would be a good starting point?