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Power Issue

S

StixBaraca

Junior Member
I recently installed a Biostar M7VIP Pro motherboard, with an Athlon XP 1800, into an Antec 300W case. When I power up the system, i get power for only a split second before everything goes dead. The lights on the front of the case stay on, but no power is supplied to the motherboard. Any thoughts or ideas?
 
Boilerplate-01:
. Most frequent causes of failure to boot:
1- RAM, CPU or AGP video card not seated properly, or a bent pin.
2- Drive data cable on upside down or only on half the pins or shifted . a pin or two (usu Floppy or Zip drives).
3- CMOS needs to be cleared (AC power must usually be disconnected or . attempt to clear CMOS may fail) Unless your mobo does not use a power-off CMOS clear - check your mobo manual for specific info.
4- On many new mobos there is a CPU protection feature (esp. on Athlon/Socket A mobos) that will not allow the system to start if there is no fan (or a fan without a working speed sensor wire) connected to the fan power connector on the mobo (specifically marked "CPU Fan"). If you tried to start your machine without a fan properly connected, you have to attach a proper and working fan and clear the CMOS before it will boot.
. Also a sign of overheating - perhaps a CPU fan failure or improperly seated heat sink.
.bh.
:beer: time!
 
This is really starting to blow my mind. I completely tore everything down. Removed RAM, CPU/fan, mobo from case, checked all contacts...the installed everything from the ground up. I double checked the IDE cables were seated, RAM, and CPU/fan are properly installed. I power is still killing out a split second after going on. I think I am going to call it a night, and try again in the morning:Q
 
Try running the mobo on the bench to insure that it is not shorting in the case. Use the manual to insure that all jumpers are set correctly. Are you using a hsf that you know to be good, or is it a new one?
 
Just to make sure here... when you say you are "powering up" the system, do you mean the switch on the power supply or the switch on the case?

Depending on your power supply / mobo combination, when you turn on the switch for the power supply the fans will start to spin up and you will see lights on the motherboard, but then the fans will stop spinning after about a second. I have seen this behavior confuse many people.

<idiot check>Make sure the switch for your power supply is in the "I" position, make sure that your power button is wired correctly to the front panel connectors on your board, and make sure you are hitting the power button on your computer.</idiot check>
 
Yes...there is good power coming from the power supply...I have double and triple checked the case/mobo wires, they all look good. I am convinced I am grounding the mobo in some way/shape/form. When i get home from work I am going to try and run the mobo out of the case and see where that leads me...I have done the idiot check...but i still feel like an idiot! This is/was going to be about the 30th box I am putting together

Baraca

"Cheese...Milk's leap towards immortality":beer:
 
Originally posted by: AbsolutDealage
<idiot check>Make sure the switch for your power supply is in the "I" position, make sure that your power button is wired correctly to the front panel connectors on your board, and make sure you are hitting the power button on your computer.</idiot check>
Click to expand...

Alright, I am having a similar problem. I don't have a switch on my power supply, yet the only way I can power up is to plug ther power cable in. How can I turn it on using the power button?

 
What I meant was that as soon as I plug the power cable in, my computer starts up. How would I get around this so that I can turn it on, instead of plugging in the cable for power? In my current predicament I can't turn off my computer once I get it going so the only way to turn it off is take the cable out.
 
Swithcing the power cable on the mobo won't help. Some mobos fire up when power is initially supplied. Is the bios set to shut the computer off with the power button? Do you hold the power button in for 4 seconds when trying to shut it off? What happens when Windows shuts down?
 
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