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TO CHECK WETHER SMPS IS WORKING OR NOT
Take a small piece of wire and connect one end in GREEN wire port and other in the BLACK. Switch ON the supply if the fan in the smps is working the smps is good. If not open the cover and check whether the Capacitors inside the Smps is bulged on the top. If bulged replace the capacitor with the same value of the earlier.Check the voltages with a multimeter.
SMPS WIRES IN ATX
WIRE VOLTAGE FUNCTION
Black 0 Ground
Blue -12 Serial Data
Brown/Violet +3.3 Sensor
Gray +5 Power good supply
Green +5 Power supply on/off
Orange +3.3 D Ram Refreshing
Purple +5 Stored by voltage
White -5 Refreshing Ram
Yellow +12 Motor Rotation
Red +5 Logic circuit
General problems encountered are-
The computer boots normally, but behaves erratically after some time.
After adding one hard disk drive and one DVD drive to a computer, which already has a hard disk and CD writer, the computer does not start.
After switching on the computer, there was no display. Continuous beeps come, indicating some abnormal condition.
After you assemble the new computer and switch on the power, it does not start.