Im trying to put my sons pc together i had a 9800 pro laying around and
tried to put it in his pc that had a nvidia card that worked fine. well
i put the 9800 in it and the moniter wont turn on after boot , its black
so i take it out and pull out my xt and try it in my p4c800 deluxe and
all is fine. anyone run into this? thanks to all that reply in advance!
If the fans in the computer aren't turning over, and the power
LED on the front of the computer doesn't light, it could be
a couple of things. One is the "AGP Warn" circuit, which
prevents the power switch from switching on the PSU, if a
3.3V AGP card is detected. The circuit does this, by checking
for a ground connection on pin A2 (TYPEDET#) on the AGP
connector. If A2 isn't being grounded by the video card, then
the "AGP Warn" circuit prevents the computer from powering up.
There is no solution for this, other than to try another brand
and design of the same video card. RMAing the motherboard
won't help, because "AGP Warn" is doing what it is supposed to
do, and the video card must ground A2 to pass this test by the
motherboard. Cards which don't ground A2, won't work.
A second reason would be a PSU overload. I read a thread (somewhere),
where the participant were having trouble with their Shuttle type
PCs when a 9800 is installed. They have discovered, that if the aux
power cable is unplugged, then turn on the computer, (see that stupid
warning on the screen about the aux power being missing), and then
they install the AUX power plug, their computer would work. It seems
on a weak power supply, the surge of current the 9800 draws rught at
startup, is interpreted by their power supply as a short circuit
happening. These guys liked their solution so much, that one of
the participants designed a circuit board to switch on the power to
the 9800 with a relay, a few seconds after the computer starts.
I don't recommend applying the power cable manually like that,
after the computer is started, as something bad could happen if the
+5 or +12V contacts make contact with the video card connector,
before the ground contacts do. As end users, we have no way of knowing
what ATI put as circuit requirements on that plug, so don't try
this at home
In any case, this solution is for <200W power
supplies, that shut down when they detect a short or overload.
I have a 9800pro 128MB and it doesn't draw a tremendous amount of
power. In 3DMark it draws
[email protected] and 12V@1A on the aux power cable.
Sitting in the BIOS, it might draw 3.5A on the +5V or so. A halfways
decent P4 compatible PSU should work, if your card is as thrifty on
power as mine is. (Mine isn't overclocked or tweaked.)
Since the P4G8X (granite bay ?) had some problems with the AGP
slot, it is also possible that you need to reduce the AGP settings
to make it work. I picked up this doc the other day, while
researching another user's P4G8X problem with lockups.
"AGP Prefetch Cache Must Be Disabled"
http://www.intel.com/design/chipsets/e7205/specupdt/25193802.pdf
This would be fixed by a BIOS update from Asus. So, if you think
it is worth it, flash upgrade the BIOS and see if the 9800 works
then. If it doesn't work, put the other video card back, and try
reducing the AGP from 8X to 4X, increase AGP voltage from 1.5V to
1.6V, Video memory cache mode [UC] should be the default anyway,
AGP/PCI Frequency [Manual], AGP/PCI Frequency MHz [66.6/33.3].
The last two shouldn't do anything, as setting to Auto for AGP/PCI
should have automatically used 66.6/33.3 anyway. Some motherboards
don't get this right, and using manual mode and selecting the
value manually, fixes them.
Post back how it works out.
HTH,
Paul
