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Showing posts from May, 2019

In Computer, Power Light is on, But There is no Apparent System Activity

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Learn how to resolve computer issue, when the power light is on, but there is no apparent system activity.

Check the Power-Supply Voltages. Use a Voltmeter to Verify that Each Output from the Power Supply is Correct. Below the Table-1 Lists the Proper Voltage for Each Wire Color.

If any Output is very Low or Absent (Especially the 5-V Output ), Replace the Power Supply. Use a Voltmeter and Verify that the Power Good (or PwrOK) Signal is the +5 V. If this Signal is Below 1.0 V, It Might Inhibit the CPU from Running by Forcing a Continuous Reset Condition. Because the Good PowerSignal is Generated by the Power Supply, Try Replacing the Power Supply.

Check to See that the CPU is Cool, that the Heatsink/Fan Assembly is Fitted on Correctly, and that the CPU Itself is Inserted Properly and Completely into its Socket.

Check the CPU Socket-If the CPU is Seated in a Zero Insertion Force (ZIF) Socket, Be Sure that the Socket's Tension Lever is Closed and Locked into Place.

If there is a Se…

In Computer There is no Power Light, But Cooling Fan Running

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Learn how to resolve a computer issue, when there is no power light, but cooling fan is running.

Usually means that some level of ac power is reaching the system. Use a voltmeter and Confirm 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.

Verify that the Power-Supply Cables are Attached properly and securely to the Motherboard. Use a Voltmeter to Verify that Each output from the Power supply is Correct.

Table-1 illustrates the Proper Voltage for Each Wire/Color. If any Output is very Low or Absent (Especially the +5 Volt Output), Replace the Power Supply. Finally, Use a Voltmeter and Verify that the Power Good (or PwrOK) Signal is +5 V.

If this Signal is Below 1.0 V, it Might Inhibit the CPU from Running by Forcing a Reset Condition. Because the Power Good Signal is Generated by the Power Supply, Try Replacing the Power Supply.
Table-1: PINOUTS of ATX and Baby AT…

In Computer There is no Power Light, and You Cannot Hear any Cooling Fan

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Learn how to resolve the issue when there is no power light, and you cannot hear any cooling fan noise in the computer.

Chances are that there is Insufficient Power to the Computer. Use a Voltmeter and Confirm that there is Adequate ac Voltage at the Wall Outlet. Check the ac Cord next-it Might be Loose or Disconnected. See that the Power Switch is Turned on and Connected Properly. Check the Power-Supply Fuse(S). The Main Fuse Might have Opened. Replace any Failed Fuse.

If You Replace the Main Fuse and the Fuse Continues to Fail, You Might have a Serious Fault in the Power supply. Try Replacing the Power Supply.