Question about Gateway Bestec ATX-300-12EB3 305w Power Supply (ATX30012EB3) Power Supply

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I have a gateway GT5676 with a ATX-300-12EB3 power supply. The system no longer powers up. When switched on the three fans rotate for a few seconds and then the whole computer powers off. I assume it is the Power supply but since the fans rotate for a few seconds I am not sure. What do you think?

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6ya6ya
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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: power LED on but no boot up

Its the Mother Board..I had the same problem and had to have a new MB put in

Posted on Dec 04, 2007

  • 310 Answers

SOURCE: Gateway 507 GR

Change your power supply.

Posted on Feb 26, 2008

Bubbabear64
  • 2794 Answers

SOURCE: New Bestec ATX 300 12E power supply showing no signs of working.

It's more than likely the motherboard needs replacement.

Posted on Jul 04, 2008

tbirdfan1
  • 3051 Answers

SOURCE: Power Supply Bestec ATX-300-12EB3- Rev: s4(S) 300-watts

yes if you can get the side plates unscrewed and the backplate plate uncrewed then the sides should lift off of the power supply now if you look at the board where all of the wires are it should be on the side by the power cord they are pretty small and some of them are soldered in so be carefull ok keep me posted ook best regards mike

Posted on Aug 26, 2008

  • 1 Answer

SOURCE: gateway gt5648e desktop power

I had temporarily solved this problem on my PC. After much research I've learned that Gateway shipped these PC's with faulty bios. What you will notice is that your machine will "loud fan reboot" every hour like clock work. Either clock in manually or use your system tools to see the exact reboots and manually reboot a minute before it shuts itself down. This has worked for myself and many others on various boards if you google the problem.

Weird? Yes!! But it worked !!! 2 months reboot free.

Posted on May 05, 2009

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After i turn on my gateway model GT5404, the three fans turn on for 3-5 seconds, then stop spinning and my system does not turn on


Yes. Exactly. You have found the problem.

http://support.gateway.com/s/pc/R/1009371/1009371nv.shtml

Uses an ATX form factor Power Supply. One that is common in a LOT of desktop computers. Readily available.

Gateway Support indicates there are three generic Power Supply makers, for the Power Supply in your computer,
Delta, HiPro, and Bestec. (Same one's for HP too)

Indicates the form factor is uATX/BTX.
Whatever, Gateway.

An ATX Power Supply's case dimensions are approximately -
6 Inches Wide, 5.5 Inches Long, and 3.5 Inches Tall.

Power cabling is also a designator when referring to ATX.
The new Power Supply's on the market, cover ATX power cabling, and more.

This is an example of an economical, yet reliable, Power Supply, that will work,

http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=4465483&CatId=1079

Has all the power cables you will need, plus more. Tie the unused power cables up out of the way. (USE plastic ties)
Concerned it is a 500 Watt unit, and not a 300 Watt unit as came with your computer?

No need to be.
1) A computer ONLY uses the power it needs, and NO more.
If you are surfing the internet, and the computer only needs a 100 Watts, it will ONLY use 100 Watts.

Playing an intensive game, or using an intensive program?
Could use the whole 500 Watts.

2) Will it harm your computer? No.
You could use a 10,000 Watt Power Supply, and it won't harm your computer. (10,000 Watt is an exaggeration)
Why?
Because a computer will ONLY use the power it needs, and NO more.

For additional questions please post in a Comment.
Regards,
joecoolvette

Aug 25, 2012 | Gateway Computers & Internet

1 Answer

How do I know if the power supply is bad on gateway gt5676 computer? I push power button and nothing happens. I unplug it and the green light flashes on the power supply( Bestec ATX 300 12 EB3). Plug it...


u can buy power supply testers, just a device you plug the power supply into, or try a new power supply. but if nothing is happening no fans etc theres a good chance its just the power supply.

Jun 17, 2012 | Computers & Internet

1 Answer

Not sure which plugs go where on the bestec atx300 power supply for gateway computer. remopved the old powere supply, but don't know which plug goes where on the new one.


I'll assume that your old PSU is also an ATX. First, the plug that has a few dozen wires arranged in a rectangle goes into the MB. Your PSU's ATX connector may be split into 2 parts: the AT portion and a square portion with 4 wires. Together, they make an ATX plug. You'll find some tiny plugs with 2-3 wires for your onboard fans. You might find a few slightly larger flat plugs with 4 wires for old floppy drives. The rest should be the regular MOLEX plugs and slim SATA power plugs for your drives.

Aug 15, 2011 | Gateway Bestec ATX-300-12EB3 305w Power...

1 Answer

No power supply power out, ps fan not coming on, fuse is good


Test your PSU or replace it if your power supply units fan is not working your PSU is faulty

Dec 30, 2010 | Gateway Emachine Bestec ATX-250-12E PS...

2 Answers

How to power up a compaq 243890-001 power supply without the the motherboard? Its not green to ground


Remove Power Supply
1 . Shut down your computer and unplug the power cord and all cables connected to the system.

2 . Open the computer case and disconnect all power connectors from the motherboard, drives, cards and fans.

3 . Remove the four screws that secure the power supply to the case. These screws are located on the back of the computer case, at each corner of the power supply.

Wire and Start Power Supply
1 . Switch the power supply to the "Off" (sometimes "O") setting.

2 . Insert the end of one wire from a single pole, single throw (SPST) switch into the green wire of the ATX power connector (the largest power supply connector).

3 . Insert the end of the other wire from the SPST switch into the black wire of the ATX power connector. If your power supply has two black wires, connect the SPST to the black wire directly beside the green wire.

4 . Wrap electrical tape around the ATX power connector and wires from the SPST switch to hold them in place. Make sure there is no exposed copper or silver wire from the SPST switch wires.

5 . Turn the SPST switch to the "Off" position, if not already set. Plug the power supply into the wall outlet and switch it to the "On" (sometimes "I")setting.

6 . Connect any other computer components that you wish to operate without the motherboard, such as fans, drives or cards. Turn the SPST to the "On" setting to activate the power supply.


Hope the above information will be helpful to you.
Thanks.

Dec 01, 2010 | Compaq (243890-001) 250-Watt Power Supply

1 Answer

My pc (gt5676) will not turn on at all. i was looking to purchase a new power supply, but want to get one that is not through gateway. i opened the tower and found atx-300-12eb3. my question is; is...


The power supply should be a standard unit. There is the odd one that has special connectors or mount holes but those aren't as common as they used to be. You should be able to get any 300 watt or larger ATX power supply and drop it in. All you need to do is make sure you get the same watt rating or larger. So you could go with a 350, 500 etc. The larger the power supply rating the more connectors it will have.As long as you have the right connectors for the motherboard cpu and then enough for all of your drives and video card or other devices then you are good to go.

The best thing you can do is take the old one out and take it with you. That way you or someone at the store can check that you have the right new power supply.

Oct 10, 2010 | Gateway Bestec ATX-300-12EB3 305w Power...

1 Answer

Power supply led blinks but will not power up


My gateway was powered up and I came back into the room and it was not. It would not turn on so I checked the power supply with the paper clip jump method (which is the only thing I know how to do) and the green light along with the fan turns on. While it is plugged into the pc, it blinks with no fan running. The power supply is an ATX 300-12EB3. The Gateway is 556GE. Thank you for any help I can get on this.

Sep 23, 2010 | Gateway Bestec ATX-300-12EB3 305w Power...

1 Answer

I am looking for a wiring diagram for my emachine front power switch


Power Supply Types

There are two basic types of power supplies. There are AT power supplies, which are older and in older computers, and ATX power supplies, which you will find in virtually every new computer you can buy.

There are two fundamental differences between AT and ATX power supplies. First, the switch mechanism is different. AT power supplies use a normal on-off switch, which directly turns the power supply on or off.

ATX power supplies use a momentary switch which does not directly control the power. Instead, the switch signals the motherboard, which performs one of three actions:

  • If the computer is off, the power supply is turned on (which turns the computer on)
  • If the computer is on, the computer goes into power-saving mode (standby)
  • If the switch is held for more than 4 seconds, the power is cut and the computer turns off.
Because of this difference, ATX power supplies are better for projects that require the second power supply to turn on automatically when the computer is turned on.

The second difference is in the motherboard connector: AT power supplies provide two 6-pin connectors (figure 1), which are easy to insert backwards. The ATX connector is a single 20-pin connector that only plugs in one way (figure 2).
2psfig1small.jpg 2psfig2small.jpg
Figures 1 and 2: The difference between AT (left) and ATX (right) motherboard connectors.
Both power supplies provide two types connectors for plugging devices into. These connectors are called Molex connectors, and they come in two sizes (see figure 3 and 4). A power supply will generally have a few of each size.
2psfig3small.jpg 2psfig4small.jpg
Figures 3 and 4: Large (left) and small (right) Molex connectors.
There is no difference between the two sizes other than the size itself. Both sizes provide the same amount of power to whatever device is plugged into it (12V and 5V). The small Molex connectors are generally used only for floppy drives. Large Molex connectors power hard drives, CD/DVD drives, and many fans and lights as well.

Note: You can purchase large and small Y-adapters if you run out of Molex connectors. Be careful when using the Y-adapters however, because if your power supply does not have enough power for all the devices attached (especially true for older, lower-wattage supplies), you can damage it.

Dec 03, 2009 | E-Machines eMachines Desktop PC

2 Answers

ATX Bestec 1956F Power Supply Failure


sounds like your power supplie has not been switched on by *********** board.the fan will not turn on until power supplie is turned on by mb.as far as what is wrong there are several things i can think of.i would try resetting bios. It sounds like your power supplie is working and your motherboard could have a short.but i have no way to be sure without testing. I can however tell you how to perform a test on your power supplie.unplug the 20 or 24 pin connector from your mb. look for a green wire,and then locate the grey one.short these two together(you can use a paper clip or something).if it dosnt power up. your power supplie is bad.also do not short any other wires,and only touch the grey and green for a few seconds as this is not how it was intended to be powered on.

Mar 03, 2009 | Bestec ATX-1956F (ATX1956F) 200-Watt Power...

1 Answer

Pc wont stard


yes that problem is because of momentarily absence of power draw the power supply outside and take the power on self test short green and black wires see fan is rotating or not. if rotating then power supply is ok if not then replace it from your vender

Nov 02, 2008 | Work Station 250W ATX POWER SUPPLY (=...

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