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Old 02-13-2005, 01:23 AM   #1 (permalink)
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Default Please Help! PC doesn't power up

Hello all,
I built a new PC today and can't get it to power up. After several experiments this is what I could figure out. I place only CPU and Ram on the motherboard just to eliminate simplify things.

1. When I connect both the 20-pin and 4-pin power connector to the motherboard, as soon as I press the power button, the power led flashes once and the pc is dead.

2. When I connect only the 20-pin connector, the power led continues to glow after I press the power button. But since there is no power supply to CPU, the system won't go any further in boot process.

Why does connecting the 4-pin connector power down the system(The green led on the motherboard will still be glowing but all the fans stop immediately)?

P4 3.2GHz
ASUS P4C800 Deluxe
1GB PC3200 DDR 400MHz memory
PSU 350W

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Old 02-13-2005, 01:27 AM   #2 (permalink)
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Join Date: Feb 2005
Posts: 286

yeah i had the saem problem 2. Make shure the ram is in right .. I dunno how that could affect it buht thats how it worked on mine. Make shure u find the cable labeled PWR Switch and plug it in horizontily on your motherboard.

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Old 02-13-2005, 03:14 AM   #3 (permalink)
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Posts: 11,600

That 4pin plug just takes strain off the +12v rail. I've actually accidentally turned my computer on without it plugged in and it still started up.

Also make sure that your board doesn't infact require a 24 pin plug and not the 20 inwhich you'd need to get a 20 to 24 pin adapter.

Besides that either the mobo or CPU is dead I'd guess.
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