Hi Michael,

Looks like you have the right connector. The 6 pin is for video cards, 
do not use this for the motherboard. It is wired backwards to the 
motherboard connector and if you connect to a motherboard (keying should 
prevent this, but you never know), you will likely blow up wither the 
MB, power supply, or both.

Russ Poffenberger
[log in to unmask]

On 2/9/2010 3:09 PM, Michael Eisenstadt wrote:
> Thanks, Russ, for your suggestions.
>
> An obvious mistake of mine was to overlook the separate connector(s)
> for the CPU which I need to attach. The mb has an 8 pin connector
> labeled ATX_12V_2x4. The schematic for the 8 pin connector in the
> manual identifies the 8 pins as follows:
>
> 1  GND  (Only for 2x4-pin 12V)
> 2  GND  (Only for 2x4-pin 12V)
> 3  GND
> 4  GND
> 5  +12V  (Only for 2x4-pin 12V)
> 6  +12V  (Only for 2x4-pin 12V)
> 7  +12V
> 8  +12V
>
> The PSU has 2 2x4-pin connectors bundled together with 2 yellow
> and 2 black wires each. Presumably the yellows are 12V and the blacks
> are GND. Presumably the 2 connectors are meant to be seated in
> the 8-pin mb connector side by side. They can only go in one way
> and the (yellow) 12V and (black) GND wires correspond to the definitions
> of the 8 pin connector (in the manual).
>
> The PSU also has a 6-pin connector with 3 yellow and 3 black wires. Perhaps
> that is to be used with other types of motherboards.
>
> I do NOT understand what "Only for 2x4-pin 12V" means in the manual's
> schematic as above.
>
> I think it wise to wait for your recommendation about this.
>
> As for the 2 other steps you outline, I believe I have installed the
> CPU correctly and secured the mb to the case correctly with
> insulated screws.
>
> Thanks again.
>
> Michael Eisenstadt
> Austin Texas
>
>
>    
>> Hi Michael,
>>
>> To jump right to the end and answer your question, either the MB or CPU
>> could be a problem. The CPU must execute BIOS instructions to be able to
>> drive the speaker to provide the beeps.
>>
>> Now to some tips on what to look for.
>>
>> 1.) Make sure that ALL the motherboard power connectors are connected!
>> Most motherboards these days require a separate 4 pin (ATX) or 8 pin
>> (SLI) connector for CPU power in addition to the standard 20 oe 24 pin
>> main power connector. It is a common mistake to forget to hook thses up.
>> Sme dual CPU Xeon motherboard actually require TWO of these, making
>> power supply selection difficult (only a few have this).
>>
>> 2.) Make sure the CPU is installed properly.
>>
>> 3.) Make sure there are no metal posts grounding out the motherboard to
>> the case.
>>
>> Steps to help isolate the problem.
>>
>> 1.) Remove all peripherals except video, memory and CPU from the
>> motherboard and try to power it on. If these works, then add them back
>> one at a time until it fails again.
>>
>> 2.) Remove the MB from the chassis entirely and hook everything up while
>> the MB is resting on a non-conductive surface to see if it will work.
>>
>> 3.) Try a different power supply. If it still doesn't work, then either
>> the MB or CPU is likely defective.
>>
>> Russ Poffenberger
>> [log in to unmask]
>>
>>      

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