Computer was working earlier, turned off unit - later tried to turn it on but it won't work
- noticed green indicator light on power supply was flashing.
- opened case of pc and noticed a green indicator light flashing on the motherboard.
- there was no indication of an electrical shortage (visible or smell)
- still... pc will not turn on.
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Close examination of your power supply may reveal if the psu is bad.
When the power supply is plug in ac socket the green indicator led inside the motherboard will lit steady green. See if by turning on the cpu you will see some sparks in the power supply connector attached to the motherboard. This is a clear indication of a bad or shorted psu.
You can also smell if there is a burning inside the psu.
See if the fan inside the psu is working if not then its a clear indication of a bad psu.
Using a multimeter if you have one measure the dc voltage coming from the supply connector. Insert the black probe to one of the black wires in the connector. And the red probe to the red wire in the connector. the reading should be +12VDC. Put the red probe to the red wire and it should read +5VDC. Any readings below this, means bad psu.
Measure also the output voltage when there is a load in the power supply. Connect a CD-ROM drive or hardisk and measure again the voltage. Dropping of voltage when put some loads is a clear indication of a bad power supply unit (psu).
I hope this will help you. Thank you for using Fixya!
Try switching it with one that you are certain works just to make sure it didnt blow or that your computer is working alright. or, using a multimeter, try and check for any current flowing to any of the connectors...
On Mac iBooks the orange light comes on when it charges the battery. Once the battery is charged it turns green. Im guessing the other powersupply was aftermarket or broken. EIther way, if it starts out green - recognizes the battery isnt full - turns orange for a while - then turns green when the battery is full, then the computer and powersupply are working perfectly. Enjoy your iBook!
Hi. NO, *********** board is not fried. I am not sure what the problem is but I do know how to fix it. It is usually casued by power outages (even if you have UPS supply).
1. TAKE OUT THE ELECTRICITY LEAD TO THE COMPUTER. Look inside the computer and find the bunch of wires coming from the power supply unit (the box thing at the top with the fan and all those colouted wires!).
2. Find where these wires run into a plastic connector and plug into the mother board. Unplug it.
3. Now plug the electicity lead back into the computer. The light should now stay ON.
4. Plug in the connector again... and boot up. Leave it run a while to convince it!
5. Repeat this process if it does not work first time.
This should fix your problem . It works for me when I get this problem.
This is an easy fix so here you go nice and simple:
Problem: Your motherboard circuit has been cut.
Causes: Power disconnected during operation. Power outage or short in the surge protector.
Symptoms: Flashing green light on both motherboard and power supply. System will not power on.
Step 1: Ensure that both the power supply and the motherboard lights are flashing green, not solid or off.
Step 2: While the power is on, disconnect the power supply from the motherboard. This connection is the largest of the connections and should be listed as the 'P1' or 'Primary' power connection.
Step 3: Wait until the green light on the motherboard stops flashing and check to ensure that the green light on the power supply is now solid. If it is not solid, disconnect the power to the power supply and wait until the light turns off completely. Then reconnect, it should be solid now.
Step 4: While the power is on, reconnect the P1 connection to the motherboard and you should now see that the light on the motherboard is solid.
Step 5: Power on your PC. The problem should not persist.
Warnings: If the power supply light remains flashing after you have restored power to it while it is disconnected from the motherboard, it may be a system failure in the power supply itself requiring replacement. Always be careful when working with an active or live power machine.
All you have to do is connect the green wire (normally thinner than the rest of the cables) to any black wire.
This can be done easily with a short piece of wire.
If the power supply doesn?t immediately turn on (within 2 seconds) remove the wire, you may have connected it to the wrong wires, although most power supplies won?t allow a short to damage the unit.
Once on, the power supply isn?t loaded so the voltages won?t be as stable as if they were used in a full PC, however it?ll be sufficient for most uses. It?s not a good idea to leave a power supply on in this fashion for a long period of time too."