No Power For Mobo Help


G

Gabriel Knight

Hi all

I bought an intel D915GAG mobo of ebay and put it together the day I got it
in the post, I tried 2 power supplies both at 450 Watt
but it gets no power to the mobo. When I press the power the cpu fan spins
for a second and then nothing, the power supplies fan dosnt spin at all. The
case for the pc is brand new and I tried to use both the reset and the power
plugs on the mobos front panel to see if the power and reset buttons were
working on the case they both work fine.
I tried to unplug the ram, hdd, cd rom and floppy but still the same
problem, nothing smells burnt on the mobo.
Any ideas? Thanks in advance

GK
 
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P

Paul

Gabriel said:
Hi all

I bought an intel D915GAG mobo of ebay and put it together the day I got it
in the post, I tried 2 power supplies both at 450 Watt
but it gets no power to the mobo. When I press the power the cpu fan spins
for a second and then nothing, the power supplies fan dosnt spin at all. The
case for the pc is brand new and I tried to use both the reset and the power
plugs on the mobos front panel to see if the power and reset buttons were
working on the case they both work fine.
I tried to unplug the ram, hdd, cd rom and floppy but still the same
problem, nothing smells burnt on the mobo.
Any ideas? Thanks in advance

GK

When the CPU fan spins for a moment and then stops, does the power supply
also stop at the same time ? And if it does, do you have to toggle
the state of the power switch on the back of the computer, in order
to get another short run from the CPU fan when next you press the
front power button on the computer ?

If could be the processor is overheating. Check that the CPU is
properly seated in the socket, and the heatsink and thermal paste
are making good contact.

The other possibility, is the Vcore regulator has sensed a problem
and is shutting down.

A third possibility, that someone raised the other day, is that
the regulator for memory may also affect the state of a motherboard.
Try unplugging all RAM sticks, with the power off on the computer.
If the computer were to start, with no RAM present, it should
sound the "No RAM" beep pattern from the computer case speaker.

In any case, simplify the hardware setup, to the minimum number
of components, and see if you can get it to run that way.

The minimum configuration I'd use, would be

motherboard, CPU+cooler, front_power_switch, computer_case_speaker, power supply

then switch on and listen for BIOS beep codes, as proof it works.
That should be enough hardware to get some beep codes running.
If it beeps, then add components until it misbehaves again.

Paul
 
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G

GlowingBlueMist

Paul said:
When the CPU fan spins for a moment and then stops, does the power
supply also stop at the same time ? And if it does, do you have to toggle
the state of the power switch on the back of the computer, in order
to get another short run from the CPU fan when next you press the
front power button on the computer ?

If could be the processor is overheating. Check that the CPU is
properly seated in the socket, and the heatsink and thermal paste
are making good contact.

The other possibility, is the Vcore regulator has sensed a problem
and is shutting down.

A third possibility, that someone raised the other day, is that
the regulator for memory may also affect the state of a motherboard.
Try unplugging all RAM sticks, with the power off on the computer.
If the computer were to start, with no RAM present, it should
sound the "No RAM" beep pattern from the computer case speaker.

In any case, simplify the hardware setup, to the minimum number
of components, and see if you can get it to run that way.

The minimum configuration I'd use, would be

motherboard, CPU+cooler, front_power_switch,
computer_case_speaker, power supply
then switch on and listen for BIOS beep codes, as proof it works.
That should be enough hardware to get some beep codes running.
If it beeps, then add components until it misbehaves again.

Paul

If the above don't help it might be worth a try taking the motherboard out
of the chassis and placing it on a non-conductive surface and then powering
it on. Too many times I've been asked to help out with a new build and they
had one stand-off too many or in the wrong place between the motherboard and
the chassis causing a short.
 

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