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which light ? You can check the way it is plugged to the wall plug too. Many fittings are not good quality and do not last forever, especially if the power leads are double plugged some way. . As it is a pc model you need to state how old it is. Might be the power supply or a component in the supply, has blown. A new power supply is cheap and actually quite easy to install. The battery on the main board may be gone. It's a small, cheap disc and easy to install.
Sounds like your Power Supply Unit(PSU) is playing up, have you installed anything new lately like more Ram, Graphics card etc.. maybe a Stick of Ram is failing, no smell of burning from the Tower/Case? If your P.C. is no longer in warranty then disconnect it from the mains supply and then remove side panel and just take a look for and signs of damage burnt,smell of smoke etc.. if no signs of that then plug in the mains and watch and listen ofr anything strange.. continuous beeps, wurring sounds etc.. If the only thing is the front light still blinks then check on the internet via another P.C. and look for troubleshooting solutions on the make and model of your P.C. website. If still no joy you could possibly change the PSU over for a new higher WATT one, they come at reasonable prices.
There can be two problems with your PC. either the power supply is faulty which is highly probable, and the other is that your Motherboard maybe faulty or both things are faulty. Try replacing the Power supply first. It should solve your 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.
Try these (un order of degree of difficulty)
1. Try replacing the battery on the system board. it is typically a CR2032 button-style battery. This helps if the computer has been off for a long time.
2. Make sure all dust has been blown or vacuumed out of the computer.
3. Check to see if the USB pins are bent inside the connector on the back and the front of the computer. Straighten if possible.
4. Remove add-in cards, fans, shrouds, and heatsinks, then check the system board for leaky or mushroomed capacitors. If you would like, this may also be a good time to see if the processor is seated correctly or possibly short-circuited (burned black on the bottom, burnt or missing pins, etc). If it is any of these, you may need a new system board (motherboard)
5. It may be that you need a new power supply. Do your best to make sure that it will fit your computer case and have all the power connectors you need; they are not created equal.
big blue flash! I would say one or more of the filter capacitors just blew up! time for a new power supply. the AC goes into the unit and a surge suppressor is across the line - looks like an orange colored disk - from there it goes to a step down transformer to a multiple output secondary. on the secondary there are numerous "bridge rectifier" circuits that take the AC and change it to usable dc. That DC is filtered with large capacitance capacitors. I have a site if I can still find it that has large wattage power supplies. I'll find it and get back to you.