- Check the ac voltage. Use a voltmeter and conform that there is adequate ac voltage at the wall outlet. Unusually low ac voltages (such as during "brownout" conditions) can cause the power supply to malfunction.
- Check the power supply cables. Verify that the power supply cables are attached properly and secure to the motherboard. A typical connection scheme is shown in figure above.
- Check the power supply voltages. Use a voltmeter to verify that each output from the power supply is correct. If any output is very low or absent (especially the +5-volt output), replace the power supply.
- Check the "Power Good" signal. Use a voltmeter and verify that the "Power Good" signal is +5 volts. If this signal is below 1.0 volt, It may inhibit the CPU from running by forcing a continous Rest condition. Since the "Power Good" signal is generated by the power supply, replace the power supply.
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Thursday, August 5, 2010
Start up Problem
If there is no power light, but you do hear the cooling fan running:
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