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CPU fan starts turning for half second then stops at start up


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#1
Mule

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:tazz: new motherboard CPU fan starts turning for half second then stops. Home PC won't start up with new motherboard.
Help
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#2
Samm

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Welcome to G2G, Mule

We need system specs please :
motherboard make/model
cpu - model/speed
memory - type & number of modules
PSU - rating in Watts & manufacturer
Video Card - type
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#3
Mule

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Since I did not give all my info the first time here goes
Motherboard Abit KV-85 mATX Socket 754 DDR400
AMD Sempron 2800+ 64bit
Memory 512meg of DDR400
Graphics card Radeon 9250 128MB
Windows 2000
POWMAX 350W Power Supply

I am having trouble starting this new motherboard and CPU. CPU fan starts turning for half second then stops during start up and nothing else happens. ???????????

What should I do? :tazz:
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#4
Samm

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OK, please follow these instructions very carefully :

1) Disconnect the power cord from the back of the computer & open up the case.

2) Wear an anti-static bacnd or at very least discharge your static by touching a metal surface

3) Disconnect the main 20pin ATX power connector from the motherboard & the square 4pin ATX2 power connector

4) Remove any PCI cards you have & disconnect ALL drive cabling from the MOTHERBOARD. Also disconnect any internal USB fly leads from the motherboard.

5) You should now have ONLY the cpu+heatsink/fan, memory & video card installed. Locate the round silver battery in the bottom right corner of the board. Just below it, you'll see a plastic jumper cap. This cap should be covering 2 pins (pins 1 + 2) with pin 3 bare. It will be marked JP1. Move the jumper to cover pins 2-3 instead. Leave in this position for about 30 seconds, then return the jumper to its original position (pins 1-2).

6) Reconnect the square 4pin ATX2 power connector & the main 20 pin ATX power connector. Make sure that the case speaker or buzzer is connected also.

7) Make sure the only external devices connected are the keyboard/mouse & monitor. Reconnect the power lead & power on the system

Let me know what happens. i.e do you hear any beeps? Does the power stay on this time? Do the keyboard lights flash up once?

BTW, when you installed the cpu into the new motherboard, did you remove the old thermal compound & apply fresh compound to the cpu/heatsink? If not, then DO NOT power the system back on until you have done this.
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#5
Mule

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:tazz: Thanks so much
It worked just as you said.
I now have the family PC up and running again with a new motherboard and CPU. Much faster than what we had before.

Thanks again and God bless
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#6
Samm

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You're very welcome :tazz:
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#7
bartec

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i've got the same problem. but when i followed the instructions and at step 7 plugged in the power supply cable, the cpu fan made a few spins. now after pressing power button it's not responding.
specifications: AsRock K8NF3, AMD 64 2800+, 1 slot 512MB 400MHZ, Radeon 9550Pro, WinXP, Feel 300 Watt
THX in advance
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#8
nnirupams

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i am using compaq presario c 300 notebook
when i press on the power button fan starts for 2 seconds and than stops
now windows continue to start...i do my work and shutdown... in this whole process fan not starts...

i mean to say that fan will only start for 2 secs at startup only and nowhere else

is this safe..?
will there be any problem...?
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#9
GL1967

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Hi, I have a similar situation. I have an Asus A8N5X Motherboard, and an error prompt on star-up commented on the Chipset fan speed was running slow. Before I was able to power down and look into it the computer stopped working. The Chipset fan was basically siezed. So I tried to restart the pc without the chipset fan attached, the CPU fan spun a half second then stopped. I then did remove the battery and the move the jumper to pins (2/3). Waited , then back to pins 1/2 and replaced the battery. The CPU fan spun like before but no beeps or anything. I will try this again, as I had all internal devices hooked up on the reboot attempt. Not sure if that would have an effect. Is there a way to tell if the chipset is fried, or any suggestions would be appreciated.

Thank
GL1967
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#10
DaveJen

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Hi! I have a similar situation with my 13 month old (1 month out of warranty) HP Pavilion P6210y.
It is AMD Athlon II 620 Quad-Core Processor
6GB Memory, 640GB Hard Drive
NVIDIA GeForce 9100 integrated graphics
Windows 7 home premium 64 bit

It froze up during game, so we had to shut the power off. When I turn it on, the CPU fan and the case fan turn on, but quickly slow down to a stop in about 3 seconds.
The power supply LED is lit and not flashing, and the fan in the power supply runs.
Other than that , I get no signal to the monitor and it goes directly to sleep. The machine does not even beep at all. The CD/DVD player tray will work and it accpts a CD and spins.

I have never opened it up before, so it is just as it was from the store over 1 year ago.
I have tried to remove the battery, removed the memory cards, uplugged and re-plugged all connections, tried starting up with hard drive, CD Rom, fans unplugged (did not unplug the USB's however).

The early responses to this thread sound promising, but since they had asked for the system info, I figured I would include mine instead of blindly trying it. Any recommendations would be greatly appreciated.

Dave
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#11
phillpower2

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Hi DaveJen :D
For future reference when seeking assistance you need to start your own topic, in this instance at the Hardware, Components and Peripherals forum, whilst the OP may seem similar to your issue/s the cause and the solution may not be the same.

It froze up during game, so we had to shut the power off. When I turn it on, the CPU fan and the case fan turn on, but quickly slow down to a stop in about 3 seconds.

Possible causes a bad PSU, bad MB inc video chip, Ram issue or a dead CPU, Have you got or can you loan a known good PSU to try, what happens if you power up with no Ram installed? If you get an error beep it may point to a bad video chip/MB, again do you have or can you loan either a pci or pci-e graphics card to try?
The CPU is harder to diagnose so we will look at that only after doing the other tests.

The power supply LED is lit and not flashing, and the fan in the power supply runs.
Other than that , I get no signal to the monitor and it goes directly to sleep. The machine does not even beep at all. The CD/DVD player tray will work and it accepts a CD and spins.

This only tells us that the MB is getting some power from the PSU, the output of PSUs is complex in that it puts out varying voltages +3.3V, +5V and +12V if any one of these is unstable you get issues such as what you are encountering the +12V that powers the atx part of the MB could be the culprit.

I have tried to remove the battery, removed the memory cards, unplugged and re-plugged all connections, tried starting up with hard drive, CD Rom, fans unplugged (did not unplug the USB's however).

Try starting with only 1 stick of Ram, the monitor and the keyboard connected, no other USBs to be connected.
Let us know how it goes.
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#12
DaveJen

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Thanks, phillpower2.

I do not have an extra PSU at my home, but I can get one today from a 2001 Dell Dimension that I gave my mother-in-law.

In the meantime, I removed all USB plugs, camera card plugs, CD Rom drive plugs, HDD plugs, Anatel card in PCIE-X1-2 slot. The only things plugged into the MB are the two fans, four pin plug from PSU, the large 24 pin plug, and the plug for the power switch. I also removed all memory cards. Plugged in monitor and power cord and turned on. Fans start for one second and you can immediately hear them slowing down to a stop. Power LED is on constant, power supply fan spinning. That's it. No beeps or anything. Keyboard has no lights at all, but mouse LED flashed for a split second.

My nephew tried a new graphics card and the same results were found.

Can I troubleshoot the power supply with a volt meter? Should the power supply from an older Dell PC be compatible with this machine? I'm leaning toward the power supply as being the cause at this point, but I still don't know enough to be certain. Thanks again for the advice.

Dave
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#13
phillpower2

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Thanks, phillpower2.

No worries I am happy to help if I can.

I do not have an extra PSU at my home, but I can get one today from a 2001 Dell Dimension that I gave my mother-in-law.

Unfortunately this will most likely not have the 24 pin plug that your MB requires.

In the meantime, I removed all USB plugs, camera card plugs, CD Rom drive plugs, HDD plugs, Anatel card in PCIE-X1-2 slot. The only things plugged into the MB are the two fans, four pin plug from PSU, the large 24 pin plug, and the plug for the power switch. I also removed all memory cards. Plugged in monitor and power cord and turned on. Fans start for one second and you can immediately hear them slowing down to a stop. Power LED is on constant, power supply fan spinning.

You have had a fair amount of peripherals connected there, it could have taken its toll on the PSU but because you get no beeps with the Ram removed it could also be the MB.

My nephew tried a new graphics card and the same results were found.

Again pointing towards the PSU or Ram.

Can I troubleshoot the power supply with a volt meter?

Only to a certain extent, specialist equipment is required to conclusively test a PSU, the equipment tricks the PSU into thinking it is acting under load, booting up, shutting down and gaming for examples the PSU will then attempt to supply or not the correct amount of stable power required for the conditions, a display then shows the Tech what voltages and Amps the PSU is producing.
When your computer is booting up it carries out the Power On Self Test (POST) procedure, if it encounters a problem component dependent on the BIOS and computer manufacturer and whether the system uses error beeps or diagnostic lights it will shut down after providing you with a signal/error code, you said you get no beeps so we can tell you have a system speaker either on the MB or the case itself, no beep suggests the PSU has malfunctioned or the MB has an issue, this includes the possibility of bad Ram slots, if the system had beeped when the Ram was removed it would suggest the Ram was ok and that POST had failed at the GFX chip.
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#14
mudcat24

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Hi I'm having the same problem

I was cleaning my pc today to remove all the dust...boy there was a lot of dust and now when I turn on the pc the CPU and PSU fans start turning and then stop while the green LED light in the front stays lit. When I was cleaning I did remove the CPU fan from the motherboard to remove all the dust from there and then put it back in.

My question is about this:

BTW, when you installed the cpu into the new motherboard, did you remove the old thermal compound & apply fresh compound to the cpu/heatsink? If not, then DO NOT power the system back on until you have done this.


Was I suppose to apply new thermal compound? The computer was working fine the day before and I just put the same CPU back in. I just wanted to know if that was necessary.

Thank you!

==========================

Specs:
Motherboard - Via Technologies P4M266-8235
CPU - Intel® Celeron® 2.40GHz
Memory - 256mb RAM DDR (PC2700)
PSU - Dynex ATX12V Model: DXPS350W 350 Watts
Video Card - Not sure...might be S3 Graphics ProSavageDDR
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#15
Neil565

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same problem... Brand new PC.. only thing from the old one is the case..
ASUS P8H77-V LE LGA 1155
Core I-5 LGA 1155
EVGA 02G-P4-2645-KR GeForce GT 640 2GB

I got the motherboard and CPU. Powered it up, nothing. The fans turn on for about two seconds, and everything turns off.
So, thinking hurricane sandy caused a power surge, I bought a new PSU, and new memory, and a replacment MB just in case the first one was a dud.. Basically replacing everything from the Old PC but the case and DVD drives.

Plug everything back in, and same problem. The only thing I can get new is the case, andI don't want to be wasting money if I don't have to.
Been building PCs since 2005, and this is the first time i've run into any issue..all the others started right perfectly the first time.

thanks :)

Edited by Neil565, 04 June 2013 - 11:57 AM.

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