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MOBO gets power. front panel does not.Fans don't spin

Tags:
  • RAM
  • Front Panel
  • Power
  • Motherboards
Last response: in Motherboards
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March 30, 2013 5:40:17 AM

Using Asus P5B mobo
Intel Core 2
2x 1.GB DIMM Kingston ram

The mobo gets powered up as indicated by LED. Power button on the front panel does not response, no on-off lights. CPU and PSU fans do not spin. RAM and CMOS have been reseated. All cables removed and reconnected.

Replaced the power unit with another one, same response. Hope I am not forced to buy a new mobo. Thanks for all help.

More about : mobo power front panel fans spin

a b V Motherboard
March 30, 2013 1:35:23 PM

Try to test with a known good power supply. If unit does not post, remove all items from mother board except cpu and see if system will give you a beep code, it should give a no memory installed beep code. If system still does not power up, remove cpu and inspect socket for bent pins.
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March 30, 2013 1:51:25 PM

knightdog56 said:
Try to test with a known good power supply. If unit does not post, remove all items from mother board except cpu and see if system will give you a beep code, it should give a no memory installed beep code. If system still does not power up, remove cpu and inspect socket for bent pins.


Thanks I will try that. You are right could be bent pin.
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March 31, 2013 12:44:28 PM

I did a pin test. With the pin attached, the PSU fan started spinning but not the CPU fan. Nothing else was connected. Obviously the front panel was dead.
When power supply to the mobo was made available, the indicator LED was lit up but not the front panel indicators. Later with HD connected no reaction from the HD either.

After the pin test with the normal power supply connected to the mobo no beep sound heard due to missing RAMs. Both CPU and PSU fans would not spin. Front screen dead as it was earlier.

The situation remains the same even when all the peripherals are in place. Mobo has power but apparently unable to supply to the front panel. No fans spin.

No pins of the CPU were bent.
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March 31, 2013 12:45:10 PM



I did a pin test. With the pin attached, the PSU fan started spinning but not the CPU fan. Nothing else was connected. Obviously the front panel was dead.
When power supply to the mobo was made available, the indicator LED was lit up but not the front panel indicators. Later with HD connected no reaction from the HD either.

After the pin test with the normal power supply connected to the mobo no beep sound heard due to missing RAMs. Both CPU and PSU fans would not spin. Front screen dead as it was earlier.

The situation remains the same even when all the peripherals are in place. Mobo has power but apparently unable to supply to the front panel. No fans spin.

No pins of the CPU were bent.
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a b V Motherboard
March 31, 2013 6:52:35 PM

Can you check the power on switch on the case to see if it is working properly?
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April 1, 2013 1:46:43 AM

knightdog56 said:
Can you check the power on switch on the case to see if it is working properly?


Nothing seems to be wrong with the switch!

I had an old old custom built machine using Antec chassis, with its own PSU. The pin test revealed that the front panel worked perfectly, the fans both on CPU and in PSU were spinning. However, when I connected power line instead of using the pin, to the MoBo the fans would not rotate and front panel became lifeless! Tried to laugh but choked.


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April 1, 2013 1:57:34 AM

knightdog56 said:
Can you check the power on switch on the case to see if it is working properly?


Nothing seems to be wrong with the switch!

I had an old old custom built machine using Antec chassis, with its own PSU. The pin test revealed that the front panel worked perfectly, the fans both on CPU and in PSU were spinning. However, when I connected power line instead of using the pin, to the MoBo the fans would not rotate and front panel became lifeless! Tried to laugh but choked.

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Best solution

a b V Motherboard
April 4, 2013 9:22:05 AM

Please try a different power supply!
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April 4, 2013 11:13:09 AM

knightdog56 said:
Please try a different power supply!


I intend to do just that, thanks. Will keep you posted.

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!