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All fans spin for a while then stop. CPU fan doesn't spin. On a working machine after a crash

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  • Computers
  • Crash
  • CPUs
  • Homebuilt
  • Systems
Last response: in Systems
January 7, 2014 2:40:38 AM

I have this homebuilt system. The computer have been working for sometime except sometimes after random crashes, it cannot start. I notice that when I try to start it, all fans (except CPU fan) spin for a while before stopping. CPU fan does not even spin. What I tried just now was:

- Ensuring the 2 main ATX power connectors are plugged in (24 and 4 pin)
- Reattach the CPU fan connector
- The above didnt work
- After removing HDD SATA cables it works (I doubt it was the HDDs problem as I didnt actually remove the HDD power cables)
- This made the computer start
- Except it crashed after awhile and the above mentioned symptoms persisted

What might be wrong here? Which component so I can send it for repairs? I cant remember the exact specs but I believe its something like

- i5 4xxx CPU
- ASUS MB
- ATI 6xxx GPU
- 8GB RAM
- Fractal Design Node 304

UPDATE

Now the computer appears to be able to boot again after leaving the case open for some time. CPU temp according to BIOS and XFCE temperature applet appears to be ~40 degrees celcius, not exactly too hot I guess ... but I cant seem to find the GPU temperature.

Other things I noticed: I have this APC surge protection power bar. And it has this "building wiring fault" indicator that turns red after I connect a device to the bar. I also tried changing the mains where I connect the power bar. The indicator turns red as soon as I connect any device. Supposedly it means the building is not properly grounded? My other devices still work tho. Also it such an indicator accurate? How do you test it the building is grounded?

More about : fans spin stop cpu fan spin working machine crash

a c 460 à CPUs
a b B Homebuilt system
January 7, 2014 3:06:02 AM

I suggest starting with the power supply.
Check alos the 8 pin power cable if in place and properly connected.
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a b à CPUs
January 7, 2014 3:08:26 AM

Yeah. See if you can try a different PSU in the system. I would recommend downloading a temperature monitoring program like Speedfan and see if there are any temperatures out of the ordinary. Can you please specify the model of the motherboard and the make and model of the PSU?
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January 7, 2014 3:14:26 AM

alexoiu said:
I suggest starting with the power supply.
Check alos the 8 pin power cable if in place and properly connected.


Yes 24 and 4 pin appears connected properly. In fact the PC is working now... it appears to be an intermittent problem ... I wonder if sending the PSU (Corsair) to the manufacturer for checks will be useful? They may not detect an intermittent problem?
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January 7, 2014 3:15:20 AM

youssef 2010 said:
Yeah. See if you can try a different PSU in the system. I would recommend downloading a temperature monitoring program like Speedfan and see if there are any temperatures out of the ordinary. Can you please specify the model of the motherboard and the make and model of the PSU?


I dont have a free PSU at the moment but I can try removing from a working PC next time if its required. Now the PC is working. So you suspect its a PSU problem too?
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a c 460 à CPUs
a b B Homebuilt system
January 7, 2014 3:18:57 AM

Or a cable connection.
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Best solution

a b à CPUs
January 7, 2014 4:40:49 AM

Try stress-testing the system using Prime 95 for the CPU and Something like Furmark for the GPU. Leave them running for an hour and see what happens. You can also try Memtest for the ram
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