Nov 21, 2009
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PC Fan Spins For One Second And Stops - No Bootup

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Read Latest Entries..: (Post #23) by iGuest on Nov 18 2009, 06:17 PM.
I had this problem on a system, it actually turned out to be the case itself.  I pulled everything out of the case, and noticed that the metal flap that supports the power supply was bent downward slightly, and that it had actually been making ever-so-slight contact with the motherboard.  I bent it back to its correct position, and the problem was gone....
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PC Fan Spins For One Second And Stops - No Bootup

WeaponX
Mar 1 2006, 12:47 AM
I just want someone to confirm this before I go online and buy the part (which is probably going to be expensive).

Just took a look at my cousin's Acer (ASUS) Pundit computer. It's one of those small form factor machines. Well, I pushed the power button and the power lights up for one second and shuts off immediately. I popped the little critter open and watched the fan spin for one second and then stop. I have to unplug the cable and replug it back in, in order to push the power again to see if turn on for one second...nothing.

My first guess was power supply...then I used one of my power supply testers on that 20 pin (I think) power cable and the fan started to spin...no problem there smile.gif This is my first time using a power supply tester, but I assume that means it's definitely NOT the power supply.

So right now, I'm guessing is has to be the motherboard right? Like I said, I want to make sure this is the correct piece to get since it will probably be expensive since this machine is not that old (about a year only). Not sure how I can test out a motherboard to be sure it's not faulty (like using power supply tester for power supply testing), so if anyone has ideas on how to do this, I'm all ears smile.gif If it helps, the ethernet port is lighted up when the power cord is plugged in...but I don't think that means anything. Board probably still bad?

Thanks.

 

 

 


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ycl
Mar 1 2006, 08:46 PM
Maybe it has something to do with your bios or there is something wrong with your drivers. If all else fails just do system restore, if that doesn't do, format your computer and reinstall windows. But that'll take a lot of time...

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HellFire121
Mar 2 2006, 09:15 AM
system restore, formatting or reinstalling windows might be a bit hard since the computer is only on for 1 second wink.gif

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James_K
Mar 2 2006, 10:35 AM
I think your best guess is to start looking at some of the other hardware components it will probebly something major since usually if there is a hardware malfunction the POST will tell you MB internal speaking to start annoyingly beep my guess is that it could be a faultly processor usually computer tend to shutdown by them sleves because it the processor is over heating although I'm sure thats not that case because your processor must be pretty hightly clocked to be overheating in one second but you might want to check like trying a different one maybe the processor is sending false reading or something like that also keep in mind you FSB could be cracked I shipped my computer ounce and fedex cracked my FSB and it would as a BSD so yah check all your hardware try replacing as much as you can with spare units but make sure they are compatible before you try. Good Luck!

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Logan Deathbringer
Mar 2 2006, 05:30 PM
ok here is what I would do if the computer was sitting on my bench at work.

1) pull out a power supply and see if I can get the thing to boot with a backup unit.

2) if that didn't work I would then replace the Lithium Ion watch battery and see if the system will now boot, if this little bios battery is dead most computers will not boot.

3) then if all else fails I will then start thinking the motherboard is dead and then order/replace it.

hope this helps and if you need more help post again. Also let us know whats going on with a post or 2.

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WeaponX
Mar 2 2006, 08:55 PM
Great suggestion Logan smile.gif I actually didn't think about the CMOS battery but definitely will give that a try. Stupid too...I was staring at the board that day and looked straight at the battery...mind is not working like it used to laugh.gif

I will post updates on this situation. Hoping it's the battery now smile.gif

Thanks.

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Logan Deathbringer
Mar 3 2006, 12:26 AM
I personally think its funny that there still hasn't been any change in the way motherboards operate. By that I mean that they haven't set them up to run the bios power off of the power supply unless power is lost then switch to the battery. I find it plain stupid, that with the level of tech we have these days we still don't power the bios off of a power supply so that if the battery dies we can still boot and get a warning on the screen rather then a totally dead system.

Just my opinion is all, you'd be surprised how many computers I have come to me that I all I have to do is replace the bios battery and I charge 80 to 120 USD to replace a 3 USD battery .... tongue.gif

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wutske
Mar 5 2006, 03:02 PM
In fact, I am pretty shure it has something to do with the PSU.
PSU testers are fine, but not perfect, so don't just trust them blindely, because there are 2 causes that make a PSU shutdown:
Overload (if not connected to the mobo then it will boot because the CPU and VGA won't load the psu anymore)
Shortage

Try disconnecting things like the hdd, cd and floppy and try again. Maybe removing an expansion card or even the vga card could help.

Other thing could be the overheat protection. Check if the cpu heatsink is still descently on the cpu. But I doubt that that would be the problem, because even a full loaded P4 can run heatsinkless for a few seconds.
Or is it a mobile cpu w/o a heatspreader ??? Because then it might work that fast.

Last thing I just think about could be a faulty cpu or cpu settings. Maybe that a CMOS reset helps ?

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qwijibow
Mar 5 2006, 09:43 PM

We have had quite a-lot of wild guesses, some from people blaming the OS before the disk has even had time to spin up, lol....

anyways, after testing the PSU, i would agree that its probably a BIOS issue. My first computer suffered exact same symtoms (which diesnt necceserily prove that its the same problem)

Unfortunatly for you... its usually easyer to replace the whole motherboard than it is to get a new bios chip, and then get that new bios chip flashed with the correct bios firmware.

but with new motherboards as cheap as £15, who cares.


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WeaponX
Mar 6 2006, 12:52 AM
I still didn't get a chance to go back yet, but it's working again...for the time being. Could it still be the PSU in that case? I'm taking a battery with me next time just to be sure.

I recall seeing the heatsink intact, but will make sure it's seated properly when I go back. I will test out the PSU by unplugging some parts to see if it still has that one second startup/shutdown...

Found the motherboard (barebones) here. Basically that's what they are using.

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Latest Entries

iGuest
Nov 18 2009, 06:17 PM

I had this problem on a system, it actually turned out to be the case itself.  I pulled everything out of the case, and noticed that the metal flap that supports the power supply was bent downward slightly, and that it had actually been making ever-so-slight contact with the motherboard.  I bent it back to its correct position, and the problem was gone.


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iGuest
Nov 13 2009, 06:43 PM
Same problem - was power supply
PC Fan Spins For One Second And Stops - No Bootup

Same problem - cpu fan would spin and then just stop.  Tried power supply in another box on another mboard with nothing connected and same results.   Replaced power supply and problem solved.

-reply by John

 


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iGuest
Oct 3 2009, 08:26 AM
laptop starts then powers down itself after few seconds - No screen display
PC Fan Spins For One Second And Stops - No Bootup

my laptop starts then powers down itself after about 7 seconds and no screen display. I removed almost everything on the board and pressed the power switch again but the problem still cant be solved. I welcome anyone who can provide me opinions.

-question by Prince Chukambiri

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iGuest
Sep 7 2009, 02:04 AM
Problem solved - faulty DVD Burner
PC Fan Spins For One Second And Stops - No Bootup

wutske's suggestion worked for me.

I had the same problem. CPU Fan cuts out after about 1 second. 

I had a second similar specifications computer that I could swap parts with.

Changed PSU - still same problem

Changed CPU - still same problem

Changed CPU & CPU Heatsink/Fan combo - still same problem

Swapped CMOS batteries - still same problem

OK, I unplugged all hardware - HDD, FDD, DVD Burner - power remains on regardless of CPU/Heatsink Combo. Yay!

Further plugging and unplugging isolated the DVD Burner.   If it is plugged in, the PSU crackles. And cuts power.

Replaced the DVD Burner -Problem solved. 

-reply by engellion

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iGuest
Jul 27 2009, 11:37 AM
cpu fan
PC Fan Spins For One Second And Stops - No Bootup

Hello Friends Actually I have a system of Intel. When I start the machine processor fans starts for 1 second and then no response means it stops. I have checked the power supply unit . One thing I found when I touch the Power connector again m,y fan rotates. POwer connector that is attached to the MOtherboard. When I remove the 12 V connect6or of processor my processor fan continuously rotates. But when I connect 12V power connector of power supply to motherboard no display no beep sound and no fan rotation If u have solution for this one kindly do a favor for me by mailing me -feedback by Nirakar Pradhan

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