PC Fan Spins For One Second And Stops - No Bootup

I had the exact same problem had to unplug then replug every time the power light and hard drive light blink for a second.Found out something when I was messing with bios battery kinda pushing on it toward +metal lead sticking up the connection was tight and didnt need my help even bent it ever so slighty to create better connection but for some reason when I pushed down and sideways the cpu fan would spin some times for 3 seconds and others for a second but I could keep doing that again and again. Worked better if I unpluged then repluged I think it is the soder or mobo. 

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.

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.

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.

All,

I have been facing this issue for about a week now, and still trying to find a solution! Here's what happened:

1. Installed a nVIDIA 9600 GT onto my D101GGC motherboard

2. Initially my PC was connected to a UPS - UPS used to BEEP loudly and shut off after a min whenever I tried to play WiC or Supreme Commander

3. Vexed as I was, I connected my PC directly to the MAINS (Stupid, Stupid!)

4. Happily played for 3-4 days (It's a great value card for the money), until one fine day (2 AM in the monrning, actually) the lights went out (literally)!

5. Cracked open the case, and saw that the PSU had blown a fuse. Replaced it with a new PSU

6. Present Day - on touching the soft-touch POWER switch, the fans (CPU/PSU) rotate for 1 sec and then stops. When the PC is connected to the MAINS, the GREEN LED on the motherboard glows, showing that the Motherboard is receivng power.

7. Disconnected all peripherals (GPU, Disk Drives, DVD ROM) and tried -no change

8. Connected a POST diagnostic PCI card to see if I can figure out whether the issue is with the CPU or motherboard - no change

I am really trying to diagnose the problem to figure out if my motherboard or CPU (or both ) has conked out, so that I can replace one or the other. Any insights/advice/help is greatly appreciated!

My PC Config: P4 3.06 GHz, 2 GB DDR RAM, D101GGC Motherboard, NVIDIA 9600GT graphics card

Thanks,SammyhunK

-reply by Sammyhunk

When I switch on my pc, the power and hdd light glow for a second, and also the smps fan spins for a second, and then everything goes blank. What's the problem ? Help me out guyz !

my pc wont start up the fan spin for 2seconds and stop after I have change the power supplier still or is it the processor faulty coz before the was a sound coming from the inside

The problem might be of SMPS.I am having the same issue.I changed the smps then it strated working fine. Even if I Reassemble the system by connecting al wires once and if I  made my SMPS short by connecting the black and green wire with each other then it also got started but for the short time period. By shorting the SMPS its fans run continuously.But finaly I changed my SMPS and from the same day it is working ok

fan runs for a moment, then stops, laptop continues to boot up.

If I continue and the fan is not running, won't I burn up the machine?

Or should I just continue and see if the fan comes back on later (not sure what tells the fan to run or not)?

Thanks!

Ive had the problem you are all experiencing before. Before you worry about changing anything else, reseat your RAM. I did this and it fixed the problem. If not ram then most likely CPU. More than likely its not the PSU due to the fact that it is starting up. Your computer goes through a series of checks upon startup and if one of your components arent working it will shut off completely. The first component that does anything is your BIOS chip. It takes information that is stored in your CMOS battery and it tells all your other components how to function. (clockrate etc. You can change these in BIOS.) from there you check your CPU (processor). Your processor communicates with a chipset called the Northbridge which in turn communicates with your RAM and your video card. It also communicates with your southbridge which in turn communicates with every I/O (input/output) device on your system. It could also be your motherboard. One of the most annoying issues to troubleshoot in my opinion.

-reply by Hewitt