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Fans turn over once but computer won't start


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#16
unbeliever1865

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The PSU has a 20 pin link but a 4 pin attachment to make it a 24 pin. There is also the 4 pin yellow/black one as well.

Motherboard is right one.
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#17
rshaffer61

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What about my question in post 14?
Is the mobo posting when bench testing outside of the case?
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#18
unbeliever1865

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Apologies - I have a terminology block I think. Could you define 'post' for me? I appreciate this will make me look dumb, but could you use less techy speak for me - makes it harder for me to follow your advice.
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#19
rshaffer61

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OK you said you are getting nothing while the mobo is in the case.
When you take the mobo out and do a bench test do you get the fans turning and the monitor shows a picture then?
If you don't know what I mean by bench test here are the instructions.

Disconnect everything from the Motherboard except
  • keyboard
  • mouse
  • video output
  • 20+4 powercable
  • 4/8 pin 12v wire both coming from the powersupply,
  • Cpu fan wire
  • power and reset button to the case
  • case speaker
Now you should have NOTHING connected to the motherboard except what was listed above.

The goal here is just to test the mobo:

If the computer still will not boot up the please remove the motherboard from the computer along with the power supply

place the motherboard on a piece of card board larger than the motherboard,

this will eliminate a short from the mobo to the case which could be a possibility

Install the cpu with, 1 stick ram in dimm 1, power supply, case switch and case speaker
Connect ps2 mouse and keyboard along with the monitor
Repeat the above and power on
If the computer now boots into bios you most likely had a case short so make sure when installing the motherboard in the case that you use standoffs,
and they line up with the mounting holes in the motherboard and none of the standoffs touch anything else on the underside of the board.


Thanks to Cbarnard for these instructions
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#20
unbeliever1865

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I appreciate the break down.

With the latter stage of set up followed - out of case on cardboard setup I get exactly the same - a spin of the fan and then nothing.
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#21
rshaffer61

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Ok and you have nothing but the instructed components connected to the system outside of the case correct?
No hard drives, optical drives, external drives or anything ?
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#22
unbeliever1865

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Nothing at all - only those parts listed.
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#23
rshaffer61

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Faulty Mobo or PSU,

OK - I've been a little stupid. My power pack isn't 230 - it's 350. Going senile it appears... Any further thoughts?

You also state it has been running fine for years on this PSU.
Now the only way to be sure is to try another PSU with at least the same wattage and would be better if more.
This way you will be assured it the problem is mobo or PSU.
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#24
unbeliever1865

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Thanks for al the help. I have a replacement PSU on the way. I'll give it another try when it arrives. Failing that I know a guy who can run it through his gizmos and can tell me more. Genuinely appreciate the time/advice though...
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#25
rshaffer61

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Thanks for the update and just remember if it still does not work then the mobo is the next most obvious issue. Please let us know what the new PSU shows once you connect it. We will watch for your results and good luck.
:D
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