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Tyan S8812 trouble

J

jebo_4jc

[H]ard|DCer of the Month - April 2011
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Apr 8, 2005
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My PC won't boot. It has been very inconsistent.

Most of the time, when I power it on, it appears to post and start up, but after 1 minute or so, a red LED will start flashing near the PCIe slot area. The fans continue to spin, but the system is totally unresponsive. The IPMI interface reports that the host is powered off, and any attempts to power it on are unsuccessful.

I saw it do this once before a few weeks ago, and I thought the problem was a grounding issue. I had it sitting on an antistatic bag at the time, so I moved it off the bag and onto a cardboard box and it worked fine. I might have wiggled the power cables or something else at the same time. Right now it's sitting on spotswood's tech bench. I have tried removing it from the tech bench and putting it back on the cardboard box, but that didn't fix the issue.

I am suspicious of the power. I am using a PCP&C 610W Silencer which only has one 8 pin EPS connector, so I am using a dual molex to EPS adaptor. Is anybody else using one of those with this mobo?

Any other ideas?
 
jebo_4jc said:
I am suspicious of the power. I am using a PCP&C 610W Silencer which only has one 8 pin EPS connector, so I am using a dual molex to EPS adaptor. Is anybody else using one of those with this mobo?
Click to expand...

I am using this adapter for at least 2 of my 4p rigs. Mine are single molex to 8 pin, and I have not had any issues. One is with a Seasonic 650 Gold and one in with a RF 900W. I wonder if you are actually close to max on that PSU with your chips. My 6166HEs only dray 465W on the gold PSU. Your chips have to draw more.
 
musky said:
I am using this adapter for at least 2 of my 4p rigs. Mine are single molex to 8 pin, and I have not had any issues. One is with a Seasonic 650 Gold and one in with a RF 900W. I wonder if you are actually close to max on that PSU with your chips. My 6166HEs only dray 465W on the gold PSU. Your chips have to draw more.
Click to expand...

Jebo, your PSU is able to supply 588W on the 12V rail. Do you have a Kill-A-Watt to see what it's pulling at the wall? If you've got the big boys pulling 105W each, at 80% efficiency, you're getting darn close to maxing the PCP&C out.

420 / 0.8 = 525W on CPU's alone. Toss in a vid card, and you're over. A handful of 120mm fans might even put you at the limit.

Edit: Math
 
I swapped the PSU out for a toughpower 750w. No change.
 
Being near capacity shouldn't prevent me from booting.
 
jebo_4jc said:
I swapped the PSU out for a toughpower 750w. No change.
Click to expand...

That PSU is likely worse. It has 4x12V rails, each only capable of 216W. If you were lucky enough to pick molex connectors from a different 12V rail than the 8 pin mobo connector, you're still putting 210W on a 216W rail.
 
Could be. Doesn't explain why I can't boot though.
 
jebo_4jc said:
Could be. Doesn't explain why I can't boot though.
Click to expand...

Yeh, your not under load, the whole system should only be taking ~250 at the wall when idle.

Bad stick of RAM? There are enough of them, maybe one is having an issue. Not sure it would cause that problem though.
 
Kendrak said:
Yeh, your not under load, the whole system should only be taking ~250 at the wall when idle.

Bad stick of RAM? There are enough of them, maybe one is having an issue. Not sure it would cause that problem though.
Click to expand...

You're both right. Even with a PSU near or at load, you should still see an attempt at booting... That's all I got. :)
 
I searched the knowledge base which reports the flashing red LED I see is this:

Red LED: The LED is used to notify about an onboard voltage error. The LED is blinking when a voltage error occurred.


This behavior began after I moved the mobo to a new chassis and added a few fans. So the problem could be a result of a bad power supply or perhaps an overvoltage on a fan header or something. I submitted a request to tech support.
 
jebo_4jc said:
I searched the knowledge base which reports the flashing red LED I see is this:

Red LED: The LED is used to notify about an onboard voltage error. The LED is blinking when a voltage error occurred.


This behavior began after I moved the mobo to a new chassis and added a few fans. So the problem could be a result of a bad power supply or perhaps an overvoltage on a fan header or something. I submitted a request to tech support.
Click to expand...

So is it a PSU problem, or a mobo v-reg problem?
 
If the rig is powering on but not booting, what happens when the reset button is pressed after power is already going? The initial draw might be too much for the PSU, but you might be able to boot with a running start....
 
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