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Wont power on, power button not working - Gateway DX4870-UB20P Core i3-2120 3.3GHz 6GB 1TB PC with HDMI & WiFi-N

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Of course do the usual things...check that the power strip is turned on or the computer is plugged into the wall, etc. Make sure it's firmly plugged into the back of the computer also. If those check out, and still no luck, you'll have to get into the computer itself. Looks like the panel on the left side comes off on that model. The power supply is at the top and back of the computer and has all the wires coming out of it. Make sure that the widest bunch of wires coming out of it (20 or 24 wires) is going to the motherboard and is plugged in firmly and all the way down. Also, there is a small group of cables that are only yellow and black (4 total wires) and should plug into a place to the upper lift of the processor, which is where the fan is in the middle of the motherboard. If those are snug, try once more. (Good idea to unplug the power cord from the back of the PC while doing this, just in case.) If still nothing, check to make sure the small wires coming from the front of the case to things like the power button are plugged in firmly. They will probably be plugged into pins on the bottom of the motherboard (usual location). If that's good and none were loose or raised up (if so, try powering it on again afterwards), you may have a dead power supply. If you don't get any fans spinning or lights, you can try one final step, though it's not necessarily indicative of a good power supply if it works. Unplug all of the connections coming from the power supply (going to the motherboard, hard drives, etc.). Once they're all loose, take a paper clip or piece of small wire or something and use it to short the green wire (on the biggest plug that was going into the motherboard) to any of the black wires (just one will do). You might want to use pliers or something for this, though I've never been shocked or anything. Make sure you plug the power cord back into the power supply before doing this as well. So, once shorted, if you don't see the fan spinning on the power supply, it's probably dead and will have to be replaced. If it works, then it may still be good and could be the motherboard possibly. However, I've seen bad power supplies run fans and such, but not be strong enough to run the whole thing. To rule out the motherboard, you basically need to either test the power supply in another computer (if you do, make sure it's comparable power-wise in watts to the other one), or get another power supply and try it on yours. Someone may have a better idea for that, but that's how I do it. Hope this helps. Let us know how it goes.

P.S. Obviously, if this is more than you want to tackle, you'll have to take it to a place that can do this for you. Statistically speaking, this problem is usually a power supply issue more times than not in my experience.

Posted on Jan 02, 2014

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You probably have a bad power supply. They are very easy to replace. You can find instructions on the internet. You can usually remove the left side panel (as you look from the front) with a couple of screws and slide backwards. The power supply will be held on by 4 screws at the back. Remove all the connectors from the motherboard (probably one long one and one smaller one) and from the hard drive and DVD drive. Take it to your local computer store and get a replacement of the same wattage or higher.

Posted on Jan 02, 2014

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