P4 system not powering up.

[Confuse]

CPU: Pentium 4 2.4Ghz 800mhz FSB
MOBO: Abit IS7
VIDEO: Radeon 9500 Pro
PS: Allied True 450W
HD: WD 100GB 8MB cache 7200 RPM, WD 60GB 5400RPM 2MB cache
CDROM: Sony 48x24x48x CDRW

I installed the motherboard using copper studs. Plugged everything in,
and then turned on the system. The first time I pressed the power
button, all the fans spinned for a second then stopped. I tried pressing
the power button again and it did not do anything. I unplugged the power
supply and plugged it in again, then tried to press the power button and
the same thing happened (turned on for half a sec, then shutdown).

I thought that the motherboard was being shorted out somehow. So I took
it out of the case and layed it on the anti static bag and ran it from
there. The same thing happened. I even took out every component out
except the CPU to see if it would still run, but it did not work. It might we worthy
to mention that the power light on the motherboard is turned on when plugged in,
but the system just doesn't power on.

I even tried to only plug in the power cable in the place where you plug all the LEDs in, etc. Did not work either. Some people I consulted were pointing their finger at perhaps the power supply, I don't know. I haven't tested this new PS with a different motherboard. Any help would be highly appreciated. Thanks in advance!

-Damian

 

[Eric1285]

I had this same problem. Pretty easy to fix. There are some lead wires from your power button at the front of your case. Those have to be plugged into a couple places on your motherboard, usually on a corner or somewhere. They tell the system to power up and such. Since you got the fans spinning, it sounds like you're only missing one. Check your motherboard manual, and it will tell you where to put them. Even missing like an LED cable will prevent the system from booting up.

 

[Confuse]

Hmmmm, I don't see any lead wires. All I have is a pair of wires going from the power switch down into the case. Then my fron bezel has a few other wires that connect to the reset button and leds. But as far as the power button is concerned, there is one one wire (two wires together as one) that goes to the motherboard.

-Damian