Solved Unable to turn on custom-built machine

August 12, 2015 at 14:52:16
Specs: Windows 7, 4GB
Hi,
I am using ECS A740GM-M AM2+ CPU with 4GB RAM. the machine was running good until recently I cannot power on. I thought it was a power supply issue, so I changed a new one. but is not resolved. When I unplugged the power cord and plug it back in to power supply, it starts CPU fan on and power supply fan running a while then stop. No matter how I press on/off switch, it just won't start again. What is wrong with the machine? motherboard broken?

Angus


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✔ Best Answer
August 14, 2015 at 00:30:28
It's quite possibly the motherboard then. When a motherboard goes bad it's sometimes due to low quality capacitors. Take a close look at the capacitors especially around the cpu as that seems to be where they fail. If they have a 'puffy' look like a soda can that's been in the freezer too long and maybe some dried residue on top indicating leakage then they're going bad. But that's just one way a motherboard can go bad. Most ways are invisible and don't show themselves like bad caps do.

There's an outside chance it's the cpu. Since it's easily swapped out, if you have a compatible one you can test the motherboard with a different cpu.



#1
August 12, 2015 at 17:07:00
With the power cord removed, temporarily disconnect all the drives and remove any unneeded cards. Disconnect any USB devices. Check that the cpu and its heatink/fan assembly are firmly attached. Then plug the power cord back in and see if it powers up. If so then likely one of the disconnected devices is at fault.

If not then yeah, since you've tried another power supply--a known working compatible one?--the motherboard is the next most likely reason.

message edited by DAVEINCAPS


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#2
August 12, 2015 at 19:25:06
No beeps when you attempt to start??

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#3
August 13, 2015 at 15:16:50
no beeping sound, i did unplug all drives and usb devices, no good still.

Angus


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#4
August 14, 2015 at 00:30:28
✔ Best Answer
It's quite possibly the motherboard then. When a motherboard goes bad it's sometimes due to low quality capacitors. Take a close look at the capacitors especially around the cpu as that seems to be where they fail. If they have a 'puffy' look like a soda can that's been in the freezer too long and maybe some dried residue on top indicating leakage then they're going bad. But that's just one way a motherboard can go bad. Most ways are invisible and don't show themselves like bad caps do.

There's an outside chance it's the cpu. Since it's easily swapped out, if you have a compatible one you can test the motherboard with a different cpu.


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