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Sandybridge fails to post

Baldbloke

Baldbloke

Baldbloke

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Joined
26 Nov 2010
Posts
1,480
Location
Thorne Yorkshire
Hi,

Built my 2500K + Asus P8p67 pro 2*2g corsair xms3 rig today.

It will not post. It has never posted. No beep. No video. No bios.
Green power led is lit. Cpu fan, gpu fan and chassis fan spin up ok.

Cpu led remains lit constantly. According to the manual this points to a cpu problem. I have inspected the socket pins. No damage as far as I can see. Inspected the chip. No visible problem.

Measured all voltages with a voltmeter. All motherboard voltages are present.

Tried to boot with a single ddr3 stick. Same symptom.

It has been a few years since I did a build. Have I overlooked something?

Thanks for your help.
 
Someone else found that the Ram should be in A1 and B1 not A2 and B2 as the manual seems to show. So ram slot nearest the CPU (Black ones) They had exactly the same problem you describe.
 
SimonMaltby said:
Someone else found that the Ram should be in A1 and B1 not A2 and B2 as the manual seems to show. So ram slot nearest the CPU (Black ones) They had exactly the same problem you describe.
Click to expand...

I have mine in A2 and B2 and all seems fine. Although in GPU-Z my memory section is blank for "Channel#. Why is this?
 
Garee said:
I have mine in A2 and B2 and all seems fine. Although in GPU-Z my memory section is blank for "Channel#. Why is this?
Click to expand...

Mine work in A2 B2 as well, but one user found that they got nothing unless it was in A1 B1 and then all was fine.

If you are using A2B2 then the first channel is A1 and has nothing in it thats why it's blank... same in CPUz Slot1 shows nothing.
 
Thanks for the quick replies folks.

As per suggestions:

Everything has supply voltage. all populated pins on the motherboard connector show correct voltages. ( By populated, I mean - minus 5v is missing but google tells me -5v is no longer used. So it can't be that).

Gpu has 2 * 6 pin connectors. 12v to all yellow wires.

Tried a cmos reset. No joy.

Tried ram in slots A1 & B1. No joy.

Tried reseating gpu. No joy.

I'm going to swap the gpu from the pc I am using now. It'll take me a few minutes.

One thing I failed to mention in the OP, on first pressing the power switch, system starts as per original description in OP (Cpu led lit) but powers itself down after 3 seconds. It then automatically restarts and remains as per the symptoms first described. No post, video or beep.
 
Whats your PSU?

Is there a red LED lit near the memory? If so press the button down next to that LED until it goes out.
 
Panic over.

I feel silly but I'll own up to it.

You were just about all correct. I failed to plug in the 2*4 pin connectors to supply cpu voltage.

Someone give me a gun, please!

And thank you.
 
Baldbloke said:
Panic over.

I feel silly but I'll own up to it.

You were just about all correct. I failed to plug in the 2*4 pin connectors to supply cpu voltage.

Someone give me a gun, please!

And thank you.
Click to expand...

I also nearly did this! Every other board I have owned has only had 1 4 pin connector.
 
Just finished my Sandy bridge install all went well apart from it would blue screen trying to boot into windows and took about a hour going through various options in the bios to sort it and in the end setting the hd to ide mode it booted fine for some reason it defaulted to another setting but seems all sorted now.

Just run a quick 3dmark06 test to compare to my i7 score.

I7 score 26543 3DMarks http://3dmark.com/3dm06/15270898

that was with my i7 @ 3.9 gig

sandy bridge score stock clocks 26499 3DMarks http://3dmark.com/3dm06/15279148

44 points in it so happy it matches big i7 overclock at stock settings.

Will overclock it in a day or so when its settled down some.
 
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