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Computer turns on for a second then shuts off When I unplug the cpu 4-pin plug from mother board the system lights up and that it.

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You might need a bigger power supply i had the same problem before and that had fixed mine

Posted on Jul 28, 2009

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I changed my cpu fan out, when i started it up it ran 30sec and shut down. So i replaced new mother board without fan., it still shuts down after a few sec. I disconected the 4 pin power source and it will...


From your problem description it sounds like the CPU was overheated (and failed) before you replaced the CPU fan - so the fan replacement was too late. Since the procesor already failed, installing a new motherboard without a fan did not accomplish anything.

The 4 pin power plug provides +12 volts DC to the processor. When you disconnected it, the processor essentially could not run at all and the system is no longer capable of detecting the CPU failure and shutting down the power supply.

You need to install a known good CPU which is the right type and speed for your computer. Unless you are experienced in replacing,CPU's, fans, heat-sinks and applying thermal grease I recommend that you have a PC technician perform these tasks.

If you believe that this information is of value to you please rate me on the FixYa website.

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Yavacotech

Nov 29, 2010 | Computers & Internet

3 Answers

Turns on, then shuts down before anything shows on monitor


Hi m5mm, what kind of Operating system are you using?

Jan 03, 2008 | Gateway GT4022 PC Desktop

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I have an old hp desktop 8570c. I tried using a product called a ''Tornado'' to transfer files to another computer. It didn't work. Now when I plug in my computer (hp 8570C), it simply runs with the busy...


If I were you I would remove the HDD from the computer and place it in an external enclosure, and then connect it via usb to another computer. This will allow you to retrieve the info you need. As for getting that computer back up and running, once you remove the files you need replace the HDD back into the system and reformat using the recovery CD's

Feb 08, 2010 | Computers & Internet

1 Answer

Re bios booting problem


Sir; I need a recap from you. You talk about one computer or many. We are only to help the final consumer and his advisor. You have gone to the CPU and took it out of socket? Do you have any special heat conducting grease to apply? Don't turn on the computer until you replace the heat transfer compound from the CPU Chip to the heat sink. Your CPU may commit suicide because of you. Anyway, I have one trick that you should check. Bypass the AC switch, not just the button, but bypass the AC, so that the Power Supply has 110 VAC all the time. There is a protection in the low voltage switch button, that, at times it false triggers (or there is a need to shut off because of an overload). When you turn on the computer, stand by with your hand on the plug to pull it, since the idea is to avoid burning up the Power Supply. If this does not work, get back to me but, please, with more descrete information. Thank you for considering our service...
My name is Constantin (arzconst)

May 27, 2009 | Gigabyte 8I845PE-RZ (GA-8I845PE-RZ)...

2 Answers

Turns on, then shuts down before anything shows on monitor


Is there more than one fan inside the computer? Did you double-check the connection from the fan to the motherboard? Sometimes a computer will shut down if it doesn't sense that the fan is turning on, to prevent the computer from overheating.

Jul 25, 2008 | Compaq Presario S5100NX (E120866) PC...

1 Answer

T2542 Emachine


It's hard to troubleshoot a power supply. They are very dangerous and contain electricity for some time after turned off. If your new one isn't solving your problem it makes me think it's not the power supply unless it's not powerful enough. Try this:
Open your case having your "CPU & HEATSINK" in sight. You can lay your case on its side if its easier to see this. Power up watching only the cpu fan located on or in the attached device over your processor (cpu). If it doesn't turn then that is likely your problem. CPU is overheating which automatically shuts down system. Pls. make sure both 20-24 pin and 4 pin plugs from power supply are tightly plugged in mother board before you start.
If it is working try another power outlet in your house. Sounds odd but is a known issue.
Could be a few more things but these are most common.
Let me know pls. your results.

Jul 19, 2008 | E-Machines eMachines Desktop PC

1 Answer

Turns on, then shuts down before anything shows on monitor


Hi ,
u check almost all ....
also check with u r power buton of front panel of pc if this button is get short then it is possible .....please disconnect switch from board & just short with any metal ....if u r pc is not geting shut down please replace rower switch ...


if this information is useful for u please Rate me........

Jun 14, 2008 | Computers & Internet

1 Answer

Computer shuts down problem


When you take the cover off and start up, are all of the fans spinning? If the CPU fan doesn't spin, the system will shut down soon after starting to prevent over heating the CPU

Feb 21, 2008 | Intel V2 (INTPRI) PC Desktop

1 Answer

No power


1. Please check with the power supply of pc from a/c plug. 2. if power supply is ok then ensure that the input poewer cord is at right position in behind of cpu. 3. If you are using old type power supply (which do not autumatically turned off by operating system) then there is problem with power switch or SMPS. 4. If you are using advance power management (generally used in now-a days computers which is automatically turned off by O.S., then there may be a problem with power pin that is connecting thae mother board and power button. Shut down your computer and open the cpu chasis and tighten the pin and ensure that it is properly inserted (the location of the pin is near hard disk lid pin, power lid pin). 5. If this pin is ok then check with pconnecting wire of pin and power button and also the power button. 6.Then turn the computer on. If it does not work then check the power connectors from SMPS to mother board are properly installed and inserted. 7. If power connector is ok then there is posssiblity of problem with your SMPS (power supply) of computer. 8.Generally due to heavy load of power and long usage the condensers of smps get mailfunctioned. Take the smps or computer to a local hardware expert.

Aug 25, 2007 | Compaq dc7100 Small Form Factor (PJ361UA)...

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