Member Avatar for GREENHOUSE

Hi all. Im building a comp using old parts and the new parts are a new hard drive and thing that holds all the parts together. Its all been put together but its not starting. I think i havent conected the motherboard too the On button correctly. my mobo is a 754pin 1869 agp. I think its the conection from front pc shell to mobo thats failing me. Or it could be all dead and a waste of my time and money .

Do you have to plug the usb things in or just need the power pins on the mobo. I done this before by trying and it worked but not this one. Can you guide me in the right direction please with connections. please. was thinking two comps would be good for online play when my brother comes round. please help me with these pins as if i get these in right and if it dosent start other parts must be broke.

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Dani AI

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Brief recap and likely causes: reported bent CPU pins that were straightened and later a grounding/short incident involving a long screw. As suggested, bent PGA pins on a Socket 754 CPU are a prime suspect, and a chassis short (or PSU protection kicking in) is an equally likely cause when the system only spins fans for a moment and then dies. Both kinds of faults can prevent any POST activity.

A safe, ordered bench-test to isolate the fault:

  1. Power off and unplug. Remove the motherboard from the case and place it on non-conductive cardboard.
  2. Fit only essentials: CPU + cooler, one known-good RAM stick (try different slots), video card if required, and the PSU. Do not connect drives, front-panel USB, or case LEDs.
  3. Make sure the main ATX connector and the 4-pin ATX12V (CPU power) are fully seated. Remove that long screw and any extra standoffs that might touch the PCB.
  4. Connect a system speaker to hear POST beeps, then short the two power-header pins briefly with a screwdriver to start the board.
  5. Observe behavior: steady POST/beeps means motherboard/CPU okay; immediate spin-then-stop usually indicates a short or PSU overload.

If the board still fails: swap in a known-good PSU or test PSU voltages under load; inspect the board for burnt components, bulging/leaking capacitors, or damaged VRM area; clear CMOS with the jumper or remove the battery for a minute. For the CPU pins: use magnification and a gentle guide (mechanical-pencil sleeve or thin credit card edge) to align pins—do not force them. If pins are broken or the CPU still won’t POST after bench-testing and swapping PSU/RAM, either the CPU or motherboard has likely been damaged and replacement or professional diagnostics are the next practical step.

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Member Avatar for joshSCH

Hmm.. well you can't simply throw old and new parts to gether and have a computer. You've got to make sure everything is compatible.. processor, ram, video card, etc.

Check your motherboard guide on how to connect the power button to the pc. There is usually 2 or 3 small wires that come out from the case and connect to the leds, power, main power, and reset button.

You don't really need anything plugged in except the motherboard, psu, and case power button.

Member Avatar for GREENHOUSE

the chip im using had like 3 bent pins and i straightened them do you think that is more likely the fault or im gettin the power to mobo connecters wrong?

Member Avatar for joshSCH

oh yea, thats probly the problem. Try to straighten those as best you can..

Member Avatar for joshSCH

Did that work?

Member Avatar for GREENHOUSE

Did that work?

i m gonna try that 2morrow. i thought they were all straight as it fitted to the board but i suppose i can go over and try an straighten them.

maybe take the chip from my working comp and place it into the older one but am scared ill damage the pins again. im gonna go over it tomoorow and ill post after that
thanks

Member Avatar for GREENHOUSE

Did that work?

hi i was shorted against my rig metal so i installed the long screw. its showing power to the fan but then stops. my comp wont turn on now lol im lost here.

Member Avatar for joshSCH

What exactly happens? Does every component receive power for a brief moment, and then just shut off? Or is it just the psu fan? Have you made sure that the components are installed properly, and that the mb is correctly grounded to the case?

Member Avatar for GREENHOUSE

its not booting up when i put the power cord in the chip fan spins a few times then stops and then it wont turn on at all

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