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PC Starts up and shuts down immediately!!!

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lolerguy's Avatar
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28-Sep-2009, 11:15 AM #1
Exclamation PC Starts up and shuts down immediately!!!
Hello.

I have a 6 years old or so PC, which used to work all fine.

But one day when i had to move it to a new spot, it suddenly didn't want to start up...

I am really sure that this has to do with the Motherboard, as i have tried the following, but with no avail:

  • Replace with new Power Supply Unit
  • Taking out CPU and RAM (Tried combinations and such)
  • Removed all other power wires, so that only the Motherboard gets power.
  • Taking out all other unimportant parts
  • Tried to replace CPU fan, same prob.
I can't really give any specs, but if you need some, please post a reply, with the required spec and i will try find out...
EDIT: Found out that i had a 1.0Ghz AMD cpu and approx. 750mb ram...

Thanks
Jake
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28-Sep-2009, 12:42 PM #2
lolerguy's Avatar
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29-Sep-2009, 06:37 AM #3
So. Does this mean that i have to buy a new motherboard? Or am i able to replace it??
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29-Sep-2009, 12:19 PM #4
If the caps are popped... yes. If you're really good with a soldering iron, you can try replacing them, but otherwise, it requires replacing the motherboard.
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29-Sep-2009, 12:35 PM #5
Well, this doesnt seem to be the problem. All of the capacitors are perfectly fine. If you have any other ideas, then i would gradly appreciate it
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29-Sep-2009, 12:35 PM #6
If you find bad capacitors you can get the capacitors replaced by this company.

http://www.badcaps.net/
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29-Sep-2009, 12:45 PM #7
Run it in safe mode uninstall all your drivers and try again.
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29-Sep-2009, 12:52 PM #8
oh just got another idea is your motherboard's battery still well there or charged? sometimes the battery can cause startup problems.
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29-Sep-2009, 12:53 PM #9
After the machine shuts down, do you have to wait to restart it, or will it restart immediately?
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29-Sep-2009, 03:46 PM #10
The battery is still in, and it should be charged.
I can't go into safe mode, as it starts up, and then it shuts down after 1/4 of a second. The cpu fan runs and a small light starts to light. Then it just go all dead. To get the fan stuff and all that to work, i need to pull out the power, and wait a sec and then put it in again.

And yes, i am pretty sure that it has nothing to do with the PSU, as i have tried to completely new one, with same results...
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29-Sep-2009, 03:51 PM #11
Have you tryed using a different hard drive? it seems to me you've tryed everything but that.
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29-Sep-2009, 05:52 PM #12
OK, if you pulled the hsf off there is a good chance you installed it back-wards. The hsf for the amd athlon type cpu has a recessed grove that fits over a lip on the cpu socket. It is possible to get this installed back-wards.

Did you clean all parts with 99% alcohol and use thermal compound?

Did you pull the motherboard when R&Ring the hsf?

Next item. It is also possible to crack the cpu die when installing the hsf.

For the above two reasons, I always recommend pulling the mb when doing a hsf install or swap on one of these old systems.
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29-Sep-2009, 05:58 PM #13
Here is a pic of the recess I am talking about.
Attached Thumbnails
PC Starts up and shuts down immediately!!!-hsf.jpg  
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30-Sep-2009, 10:27 AM #14
Well thanks for all of the replys, but i am pretty sure that it has nothig to do with the cpu, nor the hsf.

It worked perfectly fine, until i moved it into another room.

I am 100% sure it has something to do with the motherboard. I have runned the PC without CPU now, and also without fan, and it still gives me this prob.

All of the capacitors are perfectly fine. I am just really REALLY sure about this...
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30-Sep-2009, 11:35 AM #15
Ok, I'll ask this question again; After the machine shuts down, do you have to wait to restart it, or will it restart immediately?

Also, with a digital multimeter or voltmeter check the voltage output at the source (the wall plug) and if you are using a surge protector check the voltage outputs on the surge protector outlets.

In post #1 there are two statements that I have a little trouble figuring out. They are;

Taking out all other unimportant parts

Exactly which unimportant parts did you remove?

and

Tried to replace CPU fan, same prob.

If you tried to replace the CPU fan, did you "try" or did you replace it? Is the CPU fan power plug presently plugged in to the CPU fan header on the motherboard? And, if there is an auxiliary +12v processor connector on the board, is it plugged in?
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