Systems reboots on a NEC Express 5800

[Jose L Beltrami]

Hi all,

I just installed a FC1 on a NEC Express 5800 / TM1200
Below appears the complete hardware description.
The installation completed just fine (I try both, from CD and HTTP) but
the problems started upon reboot. 
The system booted Ok and I performed a yum update to the las updates
released ... To this point ... all Ok ... 
The system was configured to accept XDMCP logins from the local network
(using X -query and/or Xnest -query) ... and here appeared all the
problems.
When I logged in remotely into a gnome/kde/icewm session form other
host, at some random time the system juts reboots !!! without any
message in any log file (messages, XFree86*, etc) ... the system simply
restarts again ... sometimes without doing anything from the remote
session !!!. 
I've tried various NIC's (various models/vendors) without any change in
the system behavior. 
The system BIOS has the ACPI functions disabled.
As said, the system configuration is:

NEC Express 5800 / TM 1200
I can't find any brand name on the mainboard but the model is 694D Pro
Ver: 1.0
Is a dual PIII (socket 370) capable main with one PIII @ 866MHz
installed and 768 MbRAM (PC133)
Uses VIA Technologies chipset (see sample lspci below).
The configuration is completed with 2 Adaptec AHA-2940UW SCSI
controllers (BIOS version 1.32) with one Seagate 18 Gb hard disk each,
installed in a RAID-1 config.
The video controller is server class (only 8Mb video RAM) Nvidia Riva
TNT2 and, the ethernet card is an Intel EtherExpress Pro 100.  

[root at apps02 root]# lspci
00:00.0 Host bridge: VIA Technologies, Inc. VT82C693A/694x [Apollo
PRO133x] (rev c4)
00:01.0 PCI bridge: VIA Technologies, Inc. VT82C598/694x [Apollo
MVP3/Pro133x AGP]
00:07.0 ISA bridge: VIA Technologies, Inc. VT82C686 [Apollo Super South]
(rev 22)
00:07.1 IDE interface: VIA Technologies, Inc.
VT82C586A/B/VT82C686/A/B/VT823x/A/C/VT8235 PIPC Bus Master IDE (rev 10)
00:07.4 Host bridge: VIA Technologies, Inc. VT82C686 [Apollo Super ACPI]
(rev 30)
00:0e.0 SCSI storage controller: Adaptec AHA-2940U/UW/D / AIC-7881U (rev
01)
00:0f.0 Ethernet controller: Intel Corp. 82557/8/9 [Ethernet Pro 100]
(rev 08)
00:12.0 SCSI storage controller: Adaptec AHA-2940U/UW/D / AIC-7881U (rev
01)
01:00.0 VGA compatible controller: nVidia Corporation NV5M64 [RIVA TNT2
Model 64/Model 64 Pro] (rev 15)
[root at apps02 root]# 

Any clue on the way to debug this will be very appreciated ... I have 4
of this system and need to use Fedora as a corporative policy. 
Thank you all in advance.

	josé luis

-- 
Jose L. Beltrami <<beltrami AT netgate DOT com DOT uy>>
Ximian Evolution version: 1.4.5
Running on a: Fedora Core release 1 (Yarrow)
With kernel release: 2.4.22-1.2174.nptlsmp on a i686
(2 x (GenuineIntel, Pentium III (Coppermine) at 996.735 MHz))