A7N8X-E Deluxe Powering Off Problem

[Paul C]

I have a A78NX-E Deluxe motherboard which powers off after approx 3 minutes.

System Information:

AMD Athlon 2800+ 333MHz FSB Barton
512MB Crucial DDR 400 MHZ PC3200 CL=3 Memory Module
500 Watt QTec Power Supply
I am using the the heatsink/fan that can with the Chip
An old NVidia Riva TNT2 Model 64 AGP Graphics Card
Windows XP Home Edition
2 Hard Disks
DVD-ROM
TDK Cyclone CD-RW
Chieftec DX-01 Dragon ATX Case


I have cleared the BIOS several times. I have recently have a new Chip
as I assumed that an old Chip had died. I assumed the chip had died
because the POST worked correctly with the chip out. Now the MB powers
off after 3minutes no matter what I am doing i.e letting XP boot up or
in the BIOS. The motherboard has not run correctly since the new chip.

I have remove all cards except the video card (I only had a Asus wifi
card extra). I have tried another AGP ELSA Nvidia card. I am sure that
the heatsink is position correctly. The hardware monitor in the BIOS
shows that the CPU temperature does not get above 40 degress before the
MB powers off.

I did update the BIOS before I started to get the problems with the old
chip died (or not as the case may be).

Any clues to what the problem may be?

Thanks for any help?
Paul

 

[Paul C]

The problems seems to lie with the Q-tec power supply. Change the power
supply for an old 250W PSU and eveything runs OK. Another thing it is
so much quieter as well.

Paul