My pc won't turn on. the switch won't light, but there is a green light flashing in the back. We recently had a power outage,but the computer worked after that. I have the side open and tried to follow similar fixes,by trying to unplug and plug in diff. components but the wire colors seem different from the explanation given please help
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Please try the following: 1.remove the power cable an plug it again 2.check is the power it's on at the back of the source. 3.if you hear some noises write them down and search for the error codes on the net.
On the back of the power supply there is a 120/220 V AC selector switch.
It's possible that switch got knock on the wrong voltage position.
Pull the power cable.
Move the switch back and forth between the two position.
Make sure you leave the switch in the correct selection.
120v = USA
If you have time,open the case and inspect the RAM module(s) and card(s). They can be un-sitted.
plug in power cord and power on the pc.
First with the computer turned off make sure the switch on the power supply is set to 115v.
If you turn the computer back on and you still get a flashing green light on the back of the power supply and a constant light on the front of the computer with no video, then try replacing the power supply with either a new one or a known working good one.
If that doesn't do it then it has to be the motherboard at that point.
Keep in mind normally on those power supplies, the green light should be constant. So it has to be either the power supply is bad or the moterboard is bad and you'll know when you put a new or known good working power supply in the computer.
Failure of motherboards is usually due to breaking capacitors. A few years ago a capacitor company stole the "recipe" for making capacitors from another company and tried to make their own, unfortunately they did not get the ingredients right and the capacitors started breaking after 2-3 years of use. They sold these capacitors at very cheap prices and a lot of computer companies and power supply makers bought them. This is easy to diagnose. Look for capacitors (caps) (they look like little tiny soda cans) on your motherboard (mobo). They should be perfectly flat on top and not bulged or swelling or leaking anything. The dead giveaway is the fact that you are not getting a monitor signal and if you listen to your computer as it starts up, a few of the devices may not start (hard drive, etc). Mobos are usually expensive to replace because the computer makers have them made especially for them and only order so many. They usually do not have a lot of extras laying around. There are a few companies that will repair broken capacitor issues. Hope this explains why they can fail. They can also fail if overheated (like when a case cooling fan fails), the cpu is overclocked and not cooled down (which raises temps), the power supply fails or by lightning and power surges. Also if you add a bunch of extra components without upgrading the power supply you can suffer underpowered situations. If you can get another power supply unit then you can try that first. Usually when the condition you describe happens it is either the motherboard or Power Supply. If you replace it with another PSU then you have to have at least the same or greater output watts.
if your network cable is plugged in it will flash green .....if it won't turn on pull the plug and wait 10 seconds or more then plug in again and see if it will start .....are the fans running and no signal to monitor?