[doveman]

OK, so I got the Asrock 880GMH/U3S3.

I've just tested it with only the CPU and RAM and when pressing the power button (connected to the header, there's no on-board buttons) the PSU and CPU fans spin up for a couple of seconds but then spin down again.

It seems like it's tripping out for some reason. I don't think there's any problem with the CPU or RAM as I've been using them on another board, so I wonder if there's an issue with the PSU but I tested that with another board a few weeks ago and that was fine, so I don't really know what's up.

[submix8c]

???
I haven't read the whole thread so maybe this was mentioned? The fans will will run full-throttle then "settle down" until needed at higher temperatures. It's called "Smart Fan" and usually you can turn this ON/OFF in the BIOS somewhere.

This is normal (if it has Smart Fan) and a word of warning - I have a "monitor" software installed and it wreaks havoc if you set the Sensors-ID on the wrong Sensor (mine has 3).

This post has been edited by submix8c: 24 September 2012 - 12:50 PM

[doveman]

No, the PSU and CPU fans are stopping completely after a couple of seconds, so it's powering off.

[submix8c]

OK... so what kind of PSU is it (never seen that specified)? If it's not the correct type and/or does not have enough watts on the rails, it may not work. All of the info is sometimes provided on a sticker., otherwise you'll need to get the specs from the manufacturer. Have you "cracked it open" and CAREFULLY thoroughly cleaned it out? Sometimes "bulged" CAPS will function at lower demands but will fail at higher (just like a MoBo).

This post has been edited by submix8c: 24 September 2012 - 01:17 PM

[doveman]

It's a OCZ StealthXStream 400W. Was working fine with the same system until the original board died.

I did actually have it open recently as I needed to replace the fan which had started making annoying noises intermittently (probably the bearings were going) so I cleaned it out then and didn't notice any bulging caps. I just tested it by shorting PS_ON to GND and it stays on like that but as you say, it may have a fault that's causing it to trip out when it's under load.

I think I'll have to try my Antec PSU from my main system and see if that works with this board.

[submix8c]

Worth a shot. Also please note that all fans are not created equal.

[doveman]

Seems it is the PSU. With my Antec PSU, the CPU fan stays on, even without any RAM in the board, so it seems the OCZ PSU managed to die in between moving the system from the bench into the case. I'll have to double-check whether the original MB is actually faulty or not but I don't think the CPU fan was coming on even briefly with that, so it probably is.

[doveman]

*Deleted*

This post has been edited by doveman: 01 October 2012 - 06:41 AM