AK79D-400N system reset when playing games

AOpen AK79D-400N motherboard using nforce2 ultra chipset
Athlon XP 2500+ Barton
Corsair Value Ram 512 MB (2 x 256 MB) DDR 400
AOpen FX5600 128 MB 8x
AOpen 16x DVD
WD 80 GB SE HD 8 MB cache
Noname case with 400 watt Future Power PS
W2k with SP1
Latest video driver from nvidia 45.23
latest audio from AOpen web site


When playing Halo, Battlefield 1942 or Unreal 2 the system would reset
itself, no BSOD, screen would go black and system would startup again.
Sometimes it would do this after 15 min and sometimes it would do it
after an hour. No alarms before reset.
Using MBM temps and voltages seem normal.
At idle cpu temp is about 35 C and at load around 50 C.
2 80 mm fans pulling out in addition to 2 fans in PS.

Thought it might be PS, switched to an Antec Smart Power 400 watt and
no difference.
Tried increasing voltage to cpu ,ram and AGP ,no change.
Timing on ram is 2.5 3 3 7 (setup default)
Latest updates for software installed.

TIA

Cary

<cey.DeleteThis@home.net> wrote in message
news:g3aeovslmbior1upc1vcb3da44048o7ikm@4ax.com...
 >
 > AOpen AK79D-400N motherboard using nforce2 ultra chipset
 > Athlon XP 2500+ Barton

Are you getting power through at least a backup supply?
Maybe your current is choppy.<!-- ~MESSAGE_AFTER~ -->