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PC power starts then stops immediately

By ShadowFax ·
I have a homebuilt PC, Gigabyte P4 Titan MB, 8X AGP also Gigabyte, SATA 160GB Seagate HDD which has had to be replaced once, 512 Mb RAM - DDR 3200 dual channel- running XP Pro,,,,when it ran. When I push the power switch to start the machine the fans spin for an instant, lights on the case fan flash and all then comes to a complete stop. All other fans, CPU,AGP,Chipset & power supply, spin for a second too. Measured power supply voltages and they seem ok. Swapped out the power supply, same problem. Disconnected DVD,Floppy and HDD one at a time- same problem... and I can't figure out that problem.

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by wcp In reply to PC power starts then stop ...

This is most likely due to CPU heat problem.
Make sure that

1. The CPU heatsink unit was installed correctly. If the bottom of the heatsink does not contact fully with the CPU core, the built-in protection kicks in and the boot process stops immediately.

2. The CPU fan was connected to the right connector on the motherboard. If it was connected to a system fan connector, for example, the motherboard may stop booting process.

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by ShadowFax In reply to

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by ShadowFax In reply to PC power starts then stop ...

Reinstalled heatsink/fan after cleaning and applying Artic Silver 2. Still no joy! Could it be possible the CPU is fried? I have no other P4 machines to try to test it on.

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by maxwell edison In reply to PC power starts then stop ...

This happens to me from time to time, and when it does I start disconnecting components and unplugging wires one at a time - even the ones vital to the boot-up process. Before I get down the just the board, RAM and power supply, it will usually "kick-in", so to speak, and when I reconnect the components, it starts up just fine. I still don't know why it happened a few times, but I've always been able to get it to go with just a little tinkering. Perhaps something wasn't seated just right.

So I'd suggest the same thing for you. Disconnect one thing, and try it again; disconnect another, and try it again; and so on. When you get down to just the board, the RAM and the power supply, and if it still happens, you have either a bad board, bad RAM, or a bad processor.

(I don't think overheating is the issue because it's not on long enough to heat up.)

Also try replacing the graphics card - perhaps installing a temporary PCI card. And have you tried a different power supply?

Something else you might want to try is to verify the case panel wires one at a time. Make sure they're in the right spot and in the correct configuration (not backwards). Unplug the HDD LED, the Reset wire, the speaker wire, and the power LED. The only one your really need is the power switch wire - and if it still won't go, you can try to reverse the way you have it plugged in (diagrams in manuals have been known to be wrong.)

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by maxwell edison In reply to

Don't overlook unplugging any additional case fan and even the processor fan - at least temporarily - just to eliminate every possible source.

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by ShadowFax In reply to

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by ShadowFax In reply to PC power starts then stop ...

No joy! I'll have to get the MB and CPU checked out I guess. I'll get back to this msg. when I find the problem source for sure.

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by hughiemcginley In reply to PC power starts then stop ...

Strip the system, down to bare bones.
Video card, one piece of memory.
no mouse.
If it still does not boot.
check the power voltage setting on the board are correct the manual on the motherboard will give you the correct settings

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by razz2 In reply to PC power starts then stop ...

I would bet you have a motherboard issue or short if all the other suggestions fail. Maybe ground issue or bad capacitor etc.

Try just the power supply and the board. Start it by jumping the on terminals with a screwdriver. If that fails it's the board.

If it works then add the case connections and test. Then ad these and test after each: the cards, video, nic, modem etc. Then floppy, HDD, CD etc. You get the idea.

razz

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