My computer has been working fine until today I noticed it was off. I tried to turn it on and nothing happened. All the wires are internally connected properly (as its been working fine for years). Its a Soyo KT-600 motherboard.


The motherboard light is on. If I unplug and replug it and try to boot, the CPU fan spins for half a second (and light turns on with it) and then nothing. Could this possibly be the power supply? How can I know for sure? If its the power supply I'm not sure why the motherboard light turns on but perhaps its just giving enough power for this. It is about 4 years old. Any help is appreciated. Thanks!

Sounds like maybe the PS... Try to decrease the load and see if it fires up then...

Remove all power connectors accept the MB and HD. If the CPU fan run's off the PS, it could be going out and pulling to much current from the PS. If it does boot up then try plugging the fan in again. Don't run the computer without the CPU fan or you'll have bigger problems.

Sounds like a classic Power Supply issue... Also check it's not overheating. Clean the PS fan too...

KC

you are dead on man. Still didn't work after unplugging everything, but your post gave me the incentive to try the power supply from my other computer. And that did it. Guess I'll get a new supply tomorrow. Thanks so much!

cool, i thought it was gonna b the board

Whats the point of those motherboard "good power" leds if they just lie to you :}

I also think it is a power supply issue. Which power supply is failing is the question. Yes, the motherboard includes its own power supply that can not be replaced. Check for bloated capacitors, those round tall or fat cylinders, if they are deformed or bloated. If they are then it is your motherboard and you either have to get it RMA or upgrade to the latest AMD system. If it is not, replacing the power supply might get your computer working again. I recommend spending the money on a very good power supply because quality power supplies usually last longer than very, very cheap power supplies. Find power supplies that have active power factor controlled and universal voltage. A power supply with universal voltage will adjust it self to work with a wide voltage range usually from 100 volts to 240 volts AC. These extra features in a power supply makes the power supply cost 100 US dollars for a 300 watt unit.

Newer motherboards include an LED light to remind computer builders that there is standby current running around in the motherboard. The standby current can and does ruin components if expansion cards, memory, CPU, and BIOS if they are inserted or discharged. I recommend RTFM because it provides more information about your motherboard.

If you do not want to buy a new power supply or you bought one, you can do the following to found out the problem. First discharge the BIOS by moving the jumper, but only if there is no standby current or else bad things can happen. Put the jumper back to normal. Try powering up the computer. If it does not take out all expansion cards and this includes the video graphics card. Again there should no standby current before removing all expansion cards. For the second time, try boot up the computer. It should beep and the CPU fan should be spinning. If it is not either the computer is not booting up or the fan has just died. Try hooking up th video card and boot up the computer. If it works then something went wrong that only the gremlin knows about or the power supply that you just bought it providing the power and better filteration that the motherboard needed. While you are in your computer, it is a good time to use compressed air to take all those fluffly dust bunnines that are bouncing in the chassis out of the case. Do not use a vacuum cleaner in the computer because it creates ionization that generates several thousand volts of electricity that will damage the computer.