Cannot boot

Ladder

New Member
I am woking on this P4 machine with Aopen MX4LR motherboard. The machine cannot boot, the power supply fan is not spinning and I can only see a red light on the motherboard. I have proven that the power supply is ok and working fine when I tested it on another similar PC. When I reinstall it back to this P4 Machine the same problem occured.
-No power
-Fan not spinning
-red light on the motherboard.

Need help ASAP
 
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The fan in the supply itself is not spinning like it would in a normal working case suggests a board problem right off. Most boards have a fan regulator and setting adjustment or alarm when certain fans like a supply's or the cpu's fan falls below a certain speed. It shows the current isn't going through the board by a faulty component or bad connection somewhere.

There may be some cold solder points around the power connector's socket on the board itself to consider if no other faults are found. Look the board over carefully for any discolored areas or bulged capacitors.
 
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