Newly built PC no POST bleeps

Richie-from-the-Boro

Elggin wrote: »

Thanks for all the suggestions. The PC was built wearing ESD strap and ESD precautions taken, have built a few PC's over last 5 years so quite techy savvy. Have tried running on minimal parts i.e just Mobo/CPU and PSU running and no bleeps, tried same with one stick of ram and again with other stick. Reseated CPU twice. I am coming to conclusion made by GALLSTONES its either PSU or Mobo but currently unable to swap out with good known ones as I have not got a spare.

.1. Ok, so now you are back to the last block of post #6, desperation stakes !

- try a different VIDEO card
- try different memory / Rev
- re-seat your CPU [ you've done this one ]
- BIOS Rev is no good for the CPU
- VIDEO card doesn't like the MOBO

Many of us have spare PSU / CPU / Memory / Vid's on hand to test out DOA issues, I do realise that non builders don't have the luxury of spare known~to~be~good parts.

.2. Pull the MOBO, put it on a table on top of the antistatic bag it came in and go through the 1st block of post #6

Assuming you have the video card on it's own 6pin connector and the supplementary 4 pin connector in the MOBO & the 24 pin MOBO plug :-

- take the battery out again, and unplug from the mains
- take all cables off everywhere except the CPU fan
- put in 1 single bar of memory in slot zero
- plug in the video card and it's dedicated power cable
- connect the monitor / keyboard / mouse
- replace the battery and mains
- reboot by shorting the start pins on the MOBO with a small flathead screwdriver

If you get no joy when it's totally isolated from earthing issues. and you are unable to swap out the Vid / Memory / PSU you re stuck my friend.

The problem you now have is, if you send it back as a DOA and it turns out to be say a memory timing / voltage issue you may incur a penalty from your vendor.

Given that if you have performed the diags in post #6, you will have done all the same tests [ excluding swaps on Mem / Vid etc ] that your vendor's techie will use to judge whether or not to allow a swap out / penalty cost for testing.

This will help your case for replacement !

My personal conclusion .. .. .. I've no idea without being able to exclude via swap outs the main culprit .

jimbms

I had this a while back when building a tower, check all power plugs from the PSU as I found one that the polarity was the wrong way round due to bad manufacture.

gaming_guy

have you tried substituting the power cable (kettle lead)?

PZH

Gallstones wrote: »

Im going to say either a faulty CPU or mboard on this one.

I would have agreed about a month ago - however.....

After the exact same symptoms ( No POST, Fans and lights on, no beeps ) I finally tracked it down the the PSU.

All voltages were correct and present WITH THE EXCEPTION of Pin Eight ( Coloured Grey - is the Power_Good Signal line ). The PSU self checks and then puts +3 to + 6v on theis pin which then notifies the Mobo that it is safe to boot.

Mine was giving +2.1v - i.e. not enough for the system to boot. Changed PSU and now back up and running....
:T

ddoris

A quick visit to the manufacturers web site tells me that the CPU is not compatible with that cpu, whereas the 770ta-ud3 is compatible with that cpu.
http://www.gigabyte.com.tw/Support/Motherboard/CPUSupport_Model.aspx?ProductID=3320&ver=

http://www.gigabyte.com.tw/Support/Motherboard/CPUSupport_Model.aspx?ProductID=3272&ver=

Strider590

Make sure you haven't screwed the motherboard down too hard (squashing the inner PCB tracks).

Elggin

Update.

Thanks for all the useful suggestions finally traced to PSU connection problem now all up and running with new PSU . Again thanks to all contributors