Archived from groups: alt.comp.periphs.mainboard.asus (
More info?)
"Paul" <nospam@needed.com> wrote in message
news:nospam-0805040339080001@192.168.1.177...
> In article <245377b3.0405071734.235ab51a@posting.google.com>,
> pcbogert@yahoo.com (Peter Bogert) wrote:
>
> > I put a new A7V600-X and AMD 2500 Barton chip in an old case that
> > housed a Soyo board. It has a 400W power supply.
> >
> > When I plug the power cord into the case, the green LED light on the
> > motherboard comes on, but no power.
> >
> > I took the board out of the case, put it on a safe surface in the
> > event that the case was shorting out the board, but no go.
> >
> > Any ideas?
> >
> > Also, if I plug in the power cord to the back of the machine, the
> > power supply fan should run, shouldn't it? Mine does not.
> >
> > Help from you veterans would be greatly appreciated!
> >
> > Peter Bogert
>
> An ATX PSU has several states.
>
> Plugged in, switched off ==> No output at all. Safe to work on mobo.
> Plugged in, switched on ==> +5VSB fed to motherboard, green LED lights.
> Otherwise all is quiet. Do not install
> or remove components in this state.
> Plugged in, switched on,
> push the case pwr button ==> All outputs operate. PSU fans and case fans
> start to spin. Boot commences...
>
> One thing that will prevent some Asus boards from running, is
> placing an "illegal" AGP video into the AGP slot. There are some
> older video cards, that have a slot cut in them, indicating they
> are 1.5V cards. The TYPEDET# signal on the AGP edge card, indicates
> otherwise - that the card would like 3.3V. The Asus burnout
> prevention circuit checks the TYPEDET# signal, using a transistor
> circuit powered somehow from +5VSB. Effectively, this transistor
> circuit prevents the button press on the front of the case from
> registering, so that the AGP slot won't be damaged.
>
> To test this theory, you could try a PCI video card, or borrow
> a more modern video card to try with your mobo. I would think with
> no video card plugged in, you should at least get the beep warning
> indicating no video, and the fans should spin.
>
> If you look next to the video slot, you will see a legend that says
> "AGP_Warn". I've noticed that Asus no longer installs a red LED
> there, but there are still some of the other components for the
> circuit. I guess they'll do anything to save a nickle. Otherwise,
> it would be easy to tell that was the problem, as I could ask
> you to check to see if the red LED was lit. The only distinguishing
> feature left, is if the motherboard seems dead :-( Cheap bastards.
>
> HTH,
> Paul
After all the lunacy, I brought the machine to my office this morning, and
used a different power cord. Presto. No problem. Grrr.
But thanks for your help. I did print it out to put with my files on this
motherboard.
Facebook
Twitter
Instagram