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7.8

Motherboard fails to post BIOS: CPU Fan spins but no video or system boot.

Asked by copeasetic in General Computer Systems, Computer Motherboards

Tags: Asus, P5B-MX, System integration

System Integration Problem

Mainboard: Asus P5B-MX
Memory: 2x 1GB Kingston KVR800D2N5K2/2G
CPU: Intel Core2 Duo E6550, JGA775 2.33 Ghz, 4MB L2 Cache, 1333 Mhz FSB
Power Supply: Thermaltake TR2 RX-450 ATX 12V 2.2 (TR2 RX-450PP)
 Modular cabling power supply
Hard Drive: Seagate Baracuda 7200.10 320GB
Chassis: LianLi PC-A01

Summary:
I am a system integrator and I am building a client a small footprint workstation with the above hardware configuration.

Problem:
I have been unable to get the mainboard to post.
 - The board's power indicatior lights up when the P/S is plugged in, but not initiated (the power swith on the p/s is switched on, but the mainboard power not initiated).
 - When engaging the chasis's power switch the CPU fan starts spining, but no video or system response.
 - I have tried this with the 12v power cable unplugged as well and the fan still spins, still no post.
 - Same condition occurs when I jumper the pwrsw with a screw driver without chassis power switches plugged into the mainboard.
 - The board does not report any error codes (no beeps from system speaker)
 - Same condition occurs when CPU, Memory are the only components installed.
 - When I plug-in one of the modular power cables into the power supply and connect the hard drive power the CPU fan will not spin up when the power is engaged.
 - Monitor is functional.  

Troubleshooting efforts:
 - Removed the board from the chassis to troubleshoot the possiblity of a short.
 -No effect
 - Swapped Power Supply (Antect 450W Smart Power ATX v2.0)
 - No effect
 - Tested the old Powersupply on another system and it powered up just fine.

 - Swapped out the motherboard
 - Swapped out the CPU
 - Pulled the memory
 - Tried 1 stick of memory at a time (no error reports at all)
 - Installed video card in PCI-E slot (no change)

I am at a loss here. I am going to test the CPU in another machine today, but I find it unlikely two CPUs would be bad.

Any thoughts?
Thanks in advance!
      
 
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About this solution

Zones: General Computer Systems, Computer Motherboards
Tags: Asus, P5B-MX, System integration
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Solution Provided By: nobus
Participating Experts: 2
Solution Grade: B
 
[+][-]02/09/08 01:18 AM, ID: 20856716Expert Comment

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