New system dead! Please help!

[bg74]

Sorry for the long post, but I don't know what else to do.

My new system is completely non-functional. The stand-by power LED lights on the motherboard, but there is no reaction when I press the power switch. There is no function when tested outside the case with all of the peripherals disconnected. The fans do not run, even in the power supply.

I first assumed the power supply was bad, so I replaced that. No change. Then I thought maybe the case was shorting something, so I replaced that.

I swapped the memory, no change. I RMA’ed the motherboard; nothing. I RMA’ed the processor…nothing. I tried a different PCI-e video card. Nada.

Here’s the killer…I just bought an entirely different brand motherboard and processor…and the problem is exactly the same. This one has a numeric troubleshooting display on it….when I try to power it on, it goes from “00” to “83” (“ATX power supply ready”), but is still totally nonfunctional. There is occasionally a minor movement from the CPU fan or the fan in the power supply, but nothing else.

The 4-pin ATX power connector near the processor is connected. All of the pins are fine in that and the 24-pin power connector. I have cleared the CMOS. I am totally stumped....any ideas?

 

[maultier]

I'd suggest trying to power your rig outside the case. Just place the motherboard on a piece of plywood and hook in the power supply. I suspect something in the case is causing an issue.

 

[wunkunn]

Is this a new system that you assembled?
You stated that you tried it outside the case with all peripherals disconnected. I take this to mean there is no hard drive nor floppy drive connected by data cable nor power cable and the MB is insulated from whatever it is resting on. Did you try shorting the two power pins on the motherboard to start the boot up?
More info on the brand of MB and cpu you have would be helpful.

 

[Grenage]

Very strange and trivial things can cause the problem you describe, from all of the replacements you have made I guess we can rule out the hardware.

This may sound odd, but could you try booting it without the IDE cables attached to the motherboard?


Carlsberg don't run I.T departments, but if they did they'd probably be more fun.

 

[ASG0856]

When you say 'New', is that new to you or brand new? Because if it's brand new, I'd be taking it back to the shop for repair under guarantee, not negating the guarantee by pulling it apart!

 

[paparazi]

Given you statements I'm assuming that we at talking about at least two sets of comonents that appear to have the same symptoms? and that as you already have gathered is extremely unlikely.
From that, we can say it is likely "pilot error" sorry to use the pun but something you are doing whilst connecting
ie:
Wrong cabling etc

I think at this point it is vitally important to minimize the amount of comonents by taking everything out of the case and connecting the "BARE ESSENTIALS"
Motherboard
CPU with cooler
Graphics card (if not onboard) use PCie power connector IF REQUIRED!
1 stick of ram
PSU (making sure ALL the extra plugs are used) the last note being important because many new motherboards require several additional power plugs connecting.

No hard drive, CDRoms or any addon cards

Make sure the cmos clear jumper is set to the "run" position not "clear"


Now use a small flatblade screwdriver momentarily touching the pwr (power) header pins.

Now! what is happening?

Also could you post a full list of components etc and some history (always helps)
Martin


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