Cannot get standby mode to work on D845EBG2 board

Hello!

I am trying to get ACPI S3 Suspend to Ram to work on a 2.0GHz P4 and
D845EBG2 motherboard. I have five other machines on which it works
perfectly: two PIII Intel D815EEA boards, two PIII Intel D815EEA2 boards,
and one old Gigabyte board with a Celeron 333 on it. All computers are
hooked to a Netgear FVS318 firewall/router with a built-in 8-port 10/100
switch.

The D815EEA and D815EEA2 boards all work fine, but the D845EBG2 board will
not stay in standby. It will go into standby, but comes out almost
immediately. If I disconnect the network cable, or turn off the router, or
disable the Local Area Connection in the OS, it will go into standby and
stay there until I hit a key or move the mouse. All the Intel boards have
the same NIC listed and set to wake the system from standby (an Intel
Pro/100 VE Network Connection NIC).

I have changed ports on the router, made sure nothing is forwarded from the
router to this machine's IP address, changed the IP address, and probably a
few other things I cannot even remember. I need to have this thing in
standby and wake up from the NIC when I access it remotely.

Any ideas?

OS is XP Professional
512MB DDR RAM
Pentium 4 2.0GHz
Intel onboard Pro/100 VE NIC
ATI Rage 128 AGP 4x video
WD 40GB hard drive
52X CDROM
3.5" Floppy

Thank you for helping!

Gregg