Question about SuperMicro P4DP6-Q (P4DP6QBULK) Motherboard

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I have two Supermicro p4DP6 Q Motherboards and neither of it will turn on. I have tried 3 different power supplies in two different computer cases. The LED on the built in NIC is on when I plug the cable in. I do not find any documentation on having to ground the motherboard on one particular screw and the rest being isolated. I had a Supermicro P4DP6 before which has problems (no video) and before that all 4 LEDs next to CPU2 were on RED. The installed CPUs are 2 P4 XEON 3 GHz with 4 MBL2 cache each and HT. worked before just fine.

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  • ghoesl Feb 09, 2010

    Hi Whitefox4,

    I found the problem. it was the 8 pin connector I have to use in addition to the 24 pin power plug, which seem not to work. But also it seems that one power supply, I used, seems to be faulty, how bad I can not tell. would have to try to test on a different motherboard.
    But it seems that the video card (not the built in one) may be busted too, have to test it, because it could be that I have to change the BIOS Setting on slot3 in which I have the card installed, enabling scanning the ROM.



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Make sure the RAM memory working fine.
pull cmos cell from motherboard for 10 minutes so all settings goes to defaults.
Also reattach processor and its fan.
Remove pci cards from it if any then check.
Let me know if you need further assistance.
thanks for using FixYa.

Posted on Feb 09, 2010

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Well casing doesn't matter, but power supplies would be one of my suggestions as to testing. You must have a video card that is hooked up and working. You are getting no onboard video card with this motherboard, correct? It could either be video problem but doesn't look like it, probably a processor related issue, or even RAM memory problem could also hault power. Run a test on the PSU's with a voltmeter.

Posted on Feb 06, 2010

  • Keith Fox
    Keith Fox Feb 10, 2010

    Sounds like you have a well thought out plan to finding the solution to this :) Let me know how testing goes and I will get back to you, thanks!



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Motherboard User's Manual download page,

[ MNL-0832 (English) ]

Dual Intel 64-bit Xeon LGA 771 Quad Core processors, or Dual Core processors, at a Front Side Bus (FSB) of 1333Megahertz, or 1066MHz, with a system clock speed of 333MHz, or 267MHz."
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BIOS should automatically recognize the new processors.
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1) What is the sSpec number on the top of the processors?
2) Have you been FOLLOWING Anti-Static Precautions?

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4) No post?
Better make sure the Power Supply is good, and I mean test the three main voltages. Do not assume because fans spin, or LED's light, that the Power Supply does not have a weak voltage power rail.
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Does the Power Supply have enough power for TWO QUAD CORE processors?

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Means to me you better have at least a 500 Watt power supply, and I could be seriously underrating.

Better than an intelligent guess,
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5) Have the 4-pin ATX +12 Volt power cable attached to the motherboard, (By the 24-pin ATX main power cable connector), and the 8-pin EPS +12 Volt power cable? (Top right corner with motherboard installed in case)

6) Suggest speaker for BIOS Beep Codes, otherwise you are 'Flying Blind".

7) What kind of Thermal Paste are you using, and how did you apply it?

Not trying to be an ar-se, but if you do not answer all of my questions, do not bother to post back.

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Page 32 of the PDF file. Page 2-10 for the manuals actual page,

2-7 Connector definitions:
Power Connectors

"A 24-pin main power supply connector (JWP1), and three 8-pin CPU PWR connectors (JWP2 / JWP3 /JWP4) on the motherboard.
These power connectors meet the SSI EPS 12V (Volt) specification.

In addition to the 24-pin ATX power connector, the 12V 8-pin CPU connectors at JWP2 / JWP3 / JWP4, MUST be connected to your power supply.

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Be sure to connect these connectors to the 24-pin (JPW1) and the three 8-pin (JPW2,JPW3 and JPW4) power connectors on the motherboard.

Failure in doing so will void the manufacturer warranty on your power supply and motherboard."

So there you have it.



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Take a volt-meter, and run a continuity-test.

Are the two wires from that button both properly connected to a pair of pins on the motherboard? If you disconnect the wires from those pins, and use a metal screwdriver to very briefly "short" the two pins, to simulate the pushing of the ON/OFF button, does the motherboard post? Do fans start to spin, or at least "twitch" a few degrees?

Have you tried a different power-supply?

Is there any lamp on the motherboard that lights-up anytime that
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