Tyan S2665 does not power up with Enermax EG851AX-VH PSU

I would appreciate some help with the following problem:

I've been running my system without any problems for 2 months
Intel SC5100 server chassis with stock DELTA DPS-350EB PSU,
Tyan S2665 motherboard (BIOS Rev 1.11A),
1 Intel Xeon 2.0 GHz CPU,
2 Crucial 512Mb unbuffered PC2100 DDR modules,
1 Maxtor Atlas 10K IV "Cobra" 36GB U320 HDD,
NVidia Geforce4 MX440 video card

But finally I decided to upgrade the system to the following config:
2 Intel Xeon 2.66 GHz CPU,
4 Crucial 512Mb unbuffered PC2100 DDR modules,
4 Maxtor Atlas 10K IV "Cobra" 36GB U320 drives.

I figured out that I would need some "extra juice" to power up this new
config. So I have also ordered the Enermax EG851AX-VH EPS12V compatible PSU.
http://www.enermax.com.tw/eg851ax-vh.htm

After I received all the new components I shut the server down,
disconnected AC power, disconnected all peripheral devices,
dismounted the motherboard and removed the old CPU. Then I
installed 2 new CPUs and added 2 more memory modules. At all times I
was wearing anti-static wrist strap connected to the chassis.

At this point I got motherboard with only 2 CPUs, 4 RAM modules and video
card installed. I connected the Enermax PSU to the board and flipped
power switch on the PSU. CPU fans have spinned for a second and that was
it. The system didn't start. Pressing PowerON and Reset buttons (connected
to pins 25-26 and 29-30 of the connector J74 didn't have any effect either.
I didn't hear any diagnostic beeps.

I connected the old DELTA PSU. The CPU fans started spinning at full speed
right after I plugged in the power cord but system still didn't start. Then
I removed the CPU from CPU Socket #2 and system with single 2.66GHz CPU was
able to start with the old 350W DELTA PSU. I replaced the CPU in Socket #1
with the CPU I removed from Socket#2 earlier - the second CPU also works in
the single CPU config with the old DELTA PSU.

I tried this new ENERMAX PSU with Intel SBT2 server board with 2 Intel
Pentium III Xeon 866MHz CPUs installed - it worked just fine.

So far I have 2 working Intel Xeon CPUs, 1 working ENERMAX EPS12V
compatible PSU, 1 working (at least in single CPU config) Tyan S2665
motherboard - which do not work together. What did I miss? What is wrong
with using this PSU with the Tyan board I have?

Silly question but, do your two 2.66 CPU'shave the same spec number?

Doug

"Alex Goover" <goover DeleteThis @vernonhills.REMOVETHIS.info> wrote in message
news:opzTa.24715$BM.7816920@newssrv26.news.prodigy.com...
 > I would appreciate some help with the following problem:
 >
 > I've been running my system without any problems for 2 months
 > Intel SC5100 server chassis with stock DELTA DPS-350EB PSU,
 > Tyan S2665 motherboard (BIOS Rev 1.11A),
 > 1 Intel Xeon 2.0 GHz CPU,
 > 2 Crucial 512Mb unbuffered PC2100 DDR modules,
 > 1 Maxtor Atlas 10K IV "Cobra" 36GB U320 HDD,
 > NVidia Geforce4 MX440 video card
 >
 > But finally I decided to upgrade the system to the following config:
 > 2 Intel Xeon 2.66 GHz CPU,
 > 4 Crucial 512Mb unbuffered PC2100 DDR modules,
 > 4 Maxtor Atlas 10K IV "Cobra" 36GB U320 drives.
 >
 > I figured out that I would need some "extra juice" to power up this new
 > config. So I have also ordered the Enermax EG851AX-VH EPS12V compatible
PSU.
<font color=purple> > <a style='text-decoration: underline;' href="http://www.enermax.com.tw/eg851ax-vh.htm</font" target="_blank">http://www.enermax.com.tw/eg851ax-vh.htm</font</a>>
 >
 > After I received all the new components I shut the server down,
 > disconnected AC power, disconnected all peripheral devices,
 > dismounted the motherboard and removed the old CPU. Then I
 > installed 2 new CPUs and added 2 more memory modules. At all times I
 > was wearing anti-static wrist strap connected to the chassis.
 >
 > At this point I got motherboard with only 2 CPUs, 4 RAM modules and video
 > card installed. I connected the Enermax PSU to the board and flipped
 > power switch on the PSU. CPU fans have spinned for a second and that was
 > it. The system didn't start. Pressing PowerON and Reset buttons (connected
 > to pins 25-26 and 29-30 of the connector J74 didn't have any effect
either.
 > I didn't hear any diagnostic beeps.
 >
 > I connected the old DELTA PSU. The CPU fans started spinning at full speed
 > right after I plugged in the power cord but system still didn't start.
Then
 > I removed the CPU from CPU Socket #2 and system with single 2.66GHz CPU
was
 > able to start with the old 350W DELTA PSU. I replaced the CPU in Socket #1
 > with the CPU I removed from Socket#2 earlier - the second CPU also works
in
 > the single CPU config with the old DELTA PSU.
 >
 > I tried this new ENERMAX PSU with Intel SBT2 server board with 2 Intel
 > Pentium III Xeon 866MHz CPUs installed - it worked just fine.
 >
 > So far I have 2 working Intel Xeon CPUs, 1 working ENERMAX EPS12V
 > compatible PSU, 1 working (at least in single CPU config) Tyan S2665
 > motherboard - which do not work together. What did I miss? What is wrong
 > with using this PSU with the Tyan board I have?
 >
 ><!-- ~MESSAGE_AFTER~ -->