No Power to Motherboard

  • Thread starter Thread starter Matt
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Matt

I recently bought a Shuttle AV49VN mobo and a case with a builtin 420w
power supply. My CPU is a P4 2.66GHz, 533MHz fsb, with (2)DDR400
PC3200 512MB RAM.

I hooked up all the peripherals, powered it up, it booted up
correctly, and BIOS came up on screen. I then turned off the power
but it wouldn't come back on. AFter clearing the CMOS jumper, the
power will come back on for about a second but then shut itself down.
I"ve checked the jumper settings for my CPU speed, and the CMOS. The
CPU fan appears to be hooked up correctly as well. Occasionally after
clearing CMOS, I can get the power to come on and stay on by turning
on the main power switch in back and then turning on the front panel
power switch, but then I cannot shut the system down using the power
switch on my front panel - only by using the main power switch on the
back of the case. But then the power won't come back on at all.

Could anyone provide me with any ideas on what to check next? i
checked for grounding problems by taking the mobo out of the case and
keeping it in the box, with no change. I removed all my drives, etc.
and now just have the video card, RAM, and power supply connected to
the mobo. Same problem. So it's not the drives.

I think I need to change something in the CMOS, but I don't know what
to change.
Thanks in advance for any ideas,
Matt
 
I recently bought a Shuttle AV49VN mobo and a case with a builtin 420w
power supply. My CPU is a P4 2.66GHz, 533MHz fsb, with (2)DDR400
PC3200 512MB RAM.

I hooked up all the peripherals, powered it up, it booted up
correctly, and BIOS came up on screen. I then turned off the power
but it wouldn't come back on. AFter clearing the CMOS jumper, the
power will come back on for about a second but then shut itself down.
I"ve checked the jumper settings for my CPU speed, and the CMOS. The
CPU fan appears to be hooked up correctly as well. Occasionally after
clearing CMOS, I can get the power to come on and stay on by turning
on the main power switch in back and then turning on the front panel
power switch, but then I cannot shut the system down using the power
switch on my front panel - only by using the main power switch on the
back of the case. But then the power won't come back on at all.

Could anyone provide me with any ideas on what to check next? i
checked for grounding problems by taking the mobo out of the case and
keeping it in the box, with no change. I removed all my drives, etc.
and now just have the video card, RAM, and power supply connected to
the mobo. Same problem. So it's not the drives.

I think I need to change something in the CMOS, but I don't know what
to change.
Click to expand...

Do you have both the 20 pin and 4 pin connectors connected to the
motherboard? There are 2 power supply connectors that have to be plugged
into the motherboard on P4 systems.
 
On 3 Jan 2004 15:55:27 -0800 In this world we created
I recently bought a Shuttle AV49VN mobo and a case with a builtin 420w
power supply. My CPU is a P4 2.66GHz, 533MHz fsb, with (2)DDR400
PC3200 512MB RAM.

I hooked up all the peripherals, powered it up, it booted up
correctly, and BIOS came up on screen. I then turned off the power
but it wouldn't come back on. AFter clearing the CMOS jumper, the
power will come back on for about a second but then shut itself down.
I"ve checked the jumper settings for my CPU speed, and the CMOS. The
CPU fan appears to be hooked up correctly as well. Occasionally after
clearing CMOS, I can get the power to come on and stay on by turning
on the main power switch in back and then turning on the front panel
power switch, but then I cannot shut the system down using the power
switch on my front panel - only by using the main power switch on the
back of the case. But then the power won't come back on at all.

Could anyone provide me with any ideas on what to check next? i
checked for grounding problems by taking the mobo out of the case and
keeping it in the box, with no change. I removed all my drives, etc.
and now just have the video card, RAM, and power supply connected to
the mobo. Same problem. So it's not the drives.

I think I need to change something in the CMOS, but I don't know what
to change.
Thanks in advance for any ideas,
Matt
Click to expand...

Try clearing the CMOS with the power cord pulled out.
Also some mother boards detect that the CPU fan is on header number
one and if incorrect will shut down?

HTH :)



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Thanks for your help.

Turned out just to be a bad power supply

Everythings fine now

Matt
 
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