Question about Intel Desktop Board D845WN Motherboard

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Desktop won't start.

I have a desktop with Intel M/B type D845 WN and an AOpen power supply type ATX-250GT (P4). Problem is no start when front panel on/off switch operated. Fan in power supply not operating.
I have checked mains supply at 240V -OK, operation of on/off switch at M/B connector -OK, temporary short on M/B on/off pins - no start.
Removed all connection from power supply to M/B and etc., temporary link from pins 14 to 15 on 20 pin socket. Very brief mains on - fan starts and all power supply voltages present (measured with DVM and close to nominal value)
Reconnected only the 20 pin connector to M/B - fan starts without operation of on/off switch 5V and 12V measured at drive socket at nominal. If 4 pin (12) socket now also connected to M/B no fan - no voltages.
Have also tried operation with video card removed - no go!
These tests I have got from various web sites but now I am out of ideas and would appreciate help.

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Try to replace the power supply with another known working power supply from another P4 desktop and then reconnect your wires from the front panel led lights, changing them around until they are in the correct position. I had an almost similar problem and I did the above, it is working now. All the best ! sirjohn

Posted on Nov 01, 2009

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