Sudden system halt with P4C800E Dlx

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Hi All,

I'm having this strange behavior : am I working or not, the system halts
suddenly without switching off
the power supply, the VGA receives no more signal.
Asked for ASUS support, they made me clear CMOS, but pbm remains.
If any of you have an idea on how to isolate the cause of this, would be
greatly appreciated (since no software tool can be used).

Below are my specs :
Win XP SP2 on
ASUS P4C800E-Deluxe
P4C 3.0 Ghz
1 GB Twinx DDRAM C2PT
Radeon 9700 128MB (from Hercules)
1 SATA HDD 250 GB Hitachi
1 UDMA100 HDD 200 GB Hitachi
2 ATAPI CD/DVD
(no RAID installed)
 
Hi All,

I'm having this strange behavior : am I working or not, the system halts
suddenly without switching off
the power supply, the VGA receives no more signal.
Asked for ASUS support, they made me clear CMOS, but pbm remains.
If any of you have an idea on how to isolate the cause of this, would be
greatly appreciated (since no software tool can be used).

Below are my specs :
Win XP SP2 on
ASUS P4C800E-Deluxe
P4C 3.0 Ghz
1 GB Twinx DDRAM C2PT
Radeon 9700 128MB (from Hercules)
1 SATA HDD 250 GB Hitachi
1 UDMA100 HDD 200 GB Hitachi
2 ATAPI CD/DVD
(no RAID installed)
Click to expand...

That is certainly an irritating behavior. I think my first step would
be to tear the system apart and reassemble it, making sure there are
no ground posts on the case that are not aligned with the motherboard
mounting holes. I would be sure to re-seat every component firmly. I
would also check the seating of the heatsink fan assembly on the cpu.

If a total reassembly did not resolve it, I would be very suspicious
of the power supply and would swap it out to see how a different one
handled the system. I would also be sure to check the front panel
power switch, as I have seen some that do not spring back completely
and stay in an "almost engaged" position, which could go to "fully
engaged' with enough vibration or case flex. Obviously this could
lead to unconditional power off issues.

Good luck tracking it down.

Ender

"The only thing necessary for the triumph of evil is for good men to do nothing." Edmund Burke
 
Many thanks for your answer Ender.
I surely try this when I've time to.
I'm currently "digging" with the Hercules support since my MB works fine
with
my old Geforce 256 (limited to AGP 4x).
And my Radeon 9700 worked fine on my old ASUS K7M.
I'm a bit fed up with these AGP problems...already had ones with Geforce 256
on K7M :o(
 
Finally it seems to be resolved thanks to Hercules support.
The P4C800E Dlx has a BIOS setting named "AGP VDDQ voltage" that has to be
set to 1.5V
if using video cards compliant with both 3.3V (AGP prior to 8x) and 1.5V.
This is because MB doesn't support 3.3V and Auto setting "fails" (or seems
to) to choose the right voltage.
Hope that's it.
 
Finally it seems to be resolved thanks to Hercules support.
The P4C800E Dlx has a BIOS setting named "AGP VDDQ voltage" that has to be
set to 1.5V
if using video cards compliant with both 3.3V (AGP prior to 8x) and 1.5V.
This is because MB doesn't support 3.3V and Auto setting "fails" (or seems
to) to choose the right voltage.
Hope that's it.
Click to expand...
Thanks for posting the solution (hopefully). That would be great if
it is resolved for you with a simple bios setting.

Regards,

Ender

"The only thing necessary for the triumph of evil is for good men to do nothing." Edmund Burke
 
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