New motherboard won't boot

[Tom Hill]

I am unable to boot a new K7VM3 motherboard that I am installing in an
e-machines H2482 computer case.
I am using an Athlon XP 2400 CPU and 512-meg of DDR RAM, which both were
working correctly in another computer.
After installing the RAM, CPU and CPU fan, and connecting a 300 watt power
supply, I:

1. Connected the power cable to the motherboard
2. Connected a monitor
3. Connected the front panel power switch
4. Turned on the power switch on the power supply
5. Turned on the front panel power switch

The first time I followed these steps, the monitor did indicate the
motherboard was booting (startup routines, prompting to insert boot floppy).

I then did the following:

1. Turned off the power supply switch
2. Conncted the Hard Drive, Floppy Drive, CD Burner and CD ROM to the
mother board with ribbon cables
3. Connected the power supply cables to the Hard Drive, Floppy Drive, CD
Burner and CD ROM
4. Turned on the power switch on the power supply
5. Turned on the front panel power switch

At this point the CPU fan began spinning, but the motherboard would not
boot - nothing would appear on the monitor screen.

Then I did the following:

1. Disconnected everything from the motherboard except the monitor and the
power supply
2. Turned on the power supply switch
3. Shorted the power switch pins on the Front Panel Connector.

Again, the CPU fan began spinning but the motherboard would not boot -
nothing would appear on the monitor screen.

I tried resetting the CMOS but this had no impact.

Any ideas on what's going on here?

 

[Rob]

You getting any BIOS beep codes?
Rob
www.Totally-Hardware.co.uk

 

[Mir]

If you have tested this in another box (W/Power Supply) , then the
only thing that's left is the power supply, power button , or Case
wires.
I have built emachines before and found that some power supplies are
not a standard main conector harness wiring pattern. Some have a
reverse of 2 wires in the harness (by color) . I did not burn
anything out, but it really P***ed me off when I found out. Can't
seem to find the web page for color codes anymore but if you search
you should be able to find something. I also ran into this problem
with some dell models when replacing burnt power supplies.
Also a reverse polarity of the led wires for the case could make a non
boot for some motherboards . This may be the place to start. Some bios
instructions can be sooo picky.
I hope this helps and let us know how you make out.

 

[mikacash]

Hey Tom
I am having the same exact problem. Did you ever get a solution that
worked?

I'm trying everything and will let you know if I find a solution.
Please do the same.