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Author Topic: Computer turning itself off with no warning.  (Read 2152 times)
bigjas
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« on: December 11, 2004, 12:26:49 PM »

PLEASE SUPPLY RELEVANT INFORMATION:
Operating System Version:
Problem Application Name & Version:
Problem Hardware Make & Model:
Error Messages:


I just got done doing a rebuild on my PC. Here are the specs on everything new:
Motherboard: Shuttle AN35N Ultra
Processor: AMD Athlon XP 2500 Barton
Graphics Card: ATI Radeon 9800 Pro 128MB
Power Supply: Coolmax 150V/CX-400B (400W)

So I've hooked up everything and I turn the computer on. It stays on for a couple seconds, then it turns off. I try to turn it back on, and it won't. Basically, my PC turns itself off at random times, but always before Windows can boot up. I don't see how it can be a cooling problem, as I have two fans on the MOBO plus a case fan.

This is the first build that I have done where I have had problems, so this is new territory for me. Help would be appreciated.
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Geekgirl
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« Reply #1 on: December 11, 2004, 03:02:16 PM »

Hiya bigjas
If its shutting down before the O.S. loads then you have a hardware problem.
Here are a few steps to a boot up sequence. Look at them carefully and see at what point your pc is shutting down.

1.Power applied, power supply fan spins
2.The keyboard lights flash and rest of components are being reset
3.A BIOS message appears on the monitor
4.A memory test flickers on the monitor.
5.The floppy-disk drive access light comes on briefly (as long as it is enabled in CMOS boot sequence)
6.The hard-disk drive access light comes on briefly.
7.The system beeps indicating that it has completed its POST. After this point, it looks for an O.S.
8.The floppy-disk drive access light comes on breifly before switching to the hard drive. The BIOS is looking for addtional instructions (boot information) first the floppy then the hard drive (assuming that the CMOS setup in configured the this sequence)
9.When the system finds the boot files, the drive light comes on indicating that the system is loading the O.S and configuration files.
10.You should next see the starting windows message.
11.Windows loads GUI components and the takes over control of the system.

So there is the bootup sequence, try to find the point where it shuts down and let us know.
« Last Edit: December 11, 2004, 03:36:47 PM by Geekgirl » Logged




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bigjas
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« Reply #2 on: December 11, 2004, 03:36:06 PM »

Update:

While trying to start it up again, I saw something I hadn't noticed before, perhaps because some wiring was blocking my view of it, but the overheating LED is lighting up.

Is my CPU heatsink and fan not up to snuff?
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Geekgirl
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« Reply #3 on: December 11, 2004, 03:41:56 PM »

Have you seated the cpu and heatsink properly?
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« Reply #4 on: December 11, 2004, 04:01:48 PM »

Yep, because reseating the cpu and heatsink was one of the first things I did.
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Cactus
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« Reply #5 on: December 12, 2004, 04:29:15 PM »

When you Boot-up...do ALL the Fans spin?
Is the Fan on the HeatSink spinning?

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bigjas
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« Reply #6 on: December 12, 2004, 07:24:07 PM »

Yeah, they are all spinning.

The heat sink is aluminum, so I went ahead and ordered a copper heat sink since copper is a better heat conductor. I'll see how that goes.
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bigjas
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« Reply #7 on: December 17, 2004, 12:51:48 AM »

Update:

My copper heat sink came in today, and I'm happy to report that my computer has been running problem free for the last few hours. Appreciate it.
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« Reply #8 on: December 17, 2004, 01:05:12 AM »

Great!! Nice work bigjas ... Grin

Glad you got it all straightened out.. Wink

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