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Discussion Starter · #1 ·
Hello
My friend has a Asus A7N266 Motherboard with AMD CPU (socket A) that I built for him years ago.
Yesterday he called me and said it would not start up.
I went and checked it out, If you press the start button nothing happens, no HDD spin up no fans start.
I looked inside and it was all dusty. The CPU fan/heatsink was covered with dust. I blew out the dust but the fan, was so bad that I decided to replace the fan with a new one.
Now when I press the start button, the new fan spins for about a second and then stops.
How do i know if it's the Power Supply or the MoBo? What should I try next the PSU?
Is there a way to test the motherboard?

Thanks in advance
 

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Discussion Starter · #4 ·
Thanks for the replies :smile:
It is the original PSU.
I swapped the power supply with a good on but I still get the same problem. When I push the start button the fan spins for a second or two and then everything stops!
 

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Bench Test

Remove everything from the case
Set the motherboard on a non conductive surface. The motherboard box is perfect for this. DO NOT PLACE THE MOTHERBOARD ON THE STATIC BAG! It can actually conduct electricity!
Install the CPU and heat sink.
Install 1 stick of RAM.
Install the video card and attach the power supply connection(s) to the card if your card needs it.
Connect the monitor to the video card.
Connect the power supply to the motherboard with both the 24pin main ATX Power connection and the separate 4 or 8 pin power connection.
Connect power to the power supply.
Do NOT connect ANYTHING else. Make sure you have the power connector on the CPU fan connected.
Use a small screwdriver to momentarily short the power switch connector on the motherboard. Consult your motherboard manual to find which two pins connect to your case's power switch. Then touch both pins with a screwdriver to complete the circuit and boot the system.

If all is well, it should power up and you should get a display. Then assemble the parts into the case and try again. If the system now fails to boot, you have a short in the case and need to recheck your motherboard standoffs.

If the system does not boot after this process, then you most likely have a faulty component. You'll need to swap parts, start with the power supply, until you determine what is defective.
 
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