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Power up replaced power supply, still won't power up. possible motherboard?

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Does this mean no power at all, or just that the computer won't
post.

Do any of the fans spin ?
Do the hard drives spin up and make noises?
Do any lights come on?
Is the cord OK?
Is the rear power switch in the ON position?
Is the rear voltage selector switch set correctly?
Is the new power supply good?
(don't assume it is)

Now
Perform all changes with power off and cord unplugged (!!!)
Leave a minute or so after power down, to make sure
all the capacitors have discharged.

Touch and Hold the metal chassis with one hand to make
sure you have no static electricity, while handling cables
and I/O cards.

1) Check and wiggle all cables and I/O cards.

Remove and re-insert the I/O cards carefully

Remove and re-insert the memory modules carefully

2) Remove all I/O cards except the video graphics card
Does it power up and post now?

Remove extra memory modules, try just minimum RAM

3) Remove the Video card and see if you get any sign of
activity:

Error beeps, fans spinning up, hard drives clicking
and whiring, etc.

===============
Possible causes, with increasing degrees if repair expense:

a) Bad power supply.

b) Bad mother board connection to the power supply or
to the front panel switches.

Check the little ribbon cables.

c) Bad front panel switches.

d) Bad video card, video card shorting the I/O bus

e) Bad memory module, memory module shorting the I/O bus

f) Bad CPU

g) Bad mother board and/or chipset.


On modern mother boards, power supply control and
fan speed control are both integrated into the mother board
and chipsets. Power switch behavior can also be controlled
by the BIOS settings. This means you have to take many steps
to isolate the problem.

Hope this gets you started.

Martin.

Posted on May 08, 2008

Pull everthing off board but power supply ram cpu and heatsink. then try to power unit.

Posted on May 08, 2008

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