PC Fan Spins For One Second And Stops - No Bootup
Discussion by WeaponX with 31 Replies.
Last Update: November 12, 2011, 2:18 pm (View Latest)
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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 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 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?
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.
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 ....
I will post updates on this situation. Hoping it's the battery now
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)
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 ?
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.
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.
PC Fan Spins For One Second And Stops - No Bootup
I found this thread when I had the same problem last night. Just moved my computer to a new tower case.
Same exact problem. Tried a new bios battery. Nothing.
The same thing was happening on 2 good power supplies.
Led/fans kick on for a split second, then total shutoff.
Took my motherboard out of the case because it was working that morning in my stock HP tower. Held it in the air by the heatsink and plugged the 24 pin power and 4 pin power into it and nothing else.
Vuala! cpu fan starts and stays on. After going through the process of elimination I realized THE MOTHERBOARD WAS SHORTING ON THE METAL CASE.
If you haven't resolved it yet, try putting a non conductive foam or plastic between the case and your motherboard. I believe they sell them at electronics stores. Good luck!
-reply by ryan
careful, if you put foam between the motherboard and the metal case, the foam will most likely hold motherboard-generated heat, so you might get some errors/crashes due to overheating. If installed correctly, the motherboard should never have to touch the metal case, so you don't need to put anything between them.
The mobo overheat protection has a strange way of detecting if the heastsink is seated correctly on the cpu, everytime I've seen this just pull the heatsink/fan assembly off the cpu being careful that the cpu isn't stuck to the heatsink and then just put it back on. This has fixed the possibly same problem your expierencing.
-reply by Philipg71
Thanks ryan you a Star mate
-reply by michael
I have an AMD CPU and and Abit At8 32X mobo. I turned off the PC and went away for the weekend, when I came back I had the 1 second power up issue.
I replaced the PSU and had the same issue
I replaced the mobo with the same mobo and had the same issue
I popped in an old CPU and its FIXED!
So I would recommend checking the PSU first (buy one at Best Buy or an office supply store and use it to test - if it fixes the problem good, if not just return to the store), then the CPU or mobo (if you have any spares)
Upon closer inspection of the apparently bad cpu I noticed that my thermal compound had seeped down and shorted 2 pins! Apparently my sloppiness fried the CPU although it worked fine for 2 years...Bah.-reply by Carlos
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