Question about MGE 400W Power Supply (QG) Power Supply

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I need a new power supply

I have a MGE 400W power supply which recently failed. I'm trying to find out if there is a swap policy or warranty on this unit. I bought it used but I haven't been dumb enough to crack open the power supply. Please help.

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It's not more than 1yr and you would need to be the original purchaser with a receipt. MGE does not allow owernship transfers on warranties.

Posted on Nov 27, 2008

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I am looking for a schematic for a Dell Optiplex GX280 power supply. The supply is model HP-U2106F3.

I just replaced my GX280 power supply (mini-tower) with the following 400W for $30.

The only place I can think you will find an actual schematic for the PSU is from the manufacturer.

Feb 13, 2011 | Hi-Pro Refurbished HIPRO POWER SUPPLY FOR...

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Most computer testing facilities will test your current power supply for free. A replacement is very inexpensive to replace. Bestbuy, MicroCenter, small computer shops and buy replacemnent from, Just make sure you have the correct information for your replacement. The model number on the power supply would be your best bet in most cases. Good luck and have a great day. I buy power supplies as low as $15 dollars Generic

Jan 25, 2011 | HP ATX-400W, ATX-400W Rev. T1, HP P/N:...

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Why power supply did not work

You didn't include any additional details about your power supply so the reason that it's not working could be one of several.

I assume you're plugging this into your motherboard correctly. Make sure the main connection pins are lined up correctly. In truth, you shouldn't be able to do this incorrectly due to it only allowing it to be inserted in one direction. Another note, you can't just plug it into the wall and expect the fan to go when the circuits aren't complete (i.e testing it outside the computer).

In newer systems that is an additional 4 prong plug wire that needs to be attached to the motherboard, in addition to the 20 prong (the only BIG one) plug

Lastly, power supplies are very cheaply built, so it's also possible it has just died. You didn't mention that it was working originally either, so I don't know if it not working is a new thing.

I usually get a 'good' one (higher wattage, 600-750W or more) and reuse these from system to sytem. What's a good one? Well, that's up for discussion, but one that feels heavier, has detachable cables, and dual 12v rails. These are the features I like to see. The higher initial investment easily pays for itself over the longer lifetime.

Jul 27, 2010 | MGE 400W Power Supply (QG) Power Supply

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Do you have a diagram that would show me step by step how to install the new power suply I bought for my computer.

Their is really no diagram to show you how to hook up your supply.
You only have a hand full of plugin connections.
Your 24 pin connection to the mother board, you may or may not have a 4 pin 12 volt video connector, which has to be connected if on the board., and your fan connections.
Everything else is controled thru the motherboard.

Nov 25, 2009 | MGE 400W Power Supply (QG) Power Supply

2 Answers

Capacitors C36 and C50 overheated what caused the problem? The computer was on unattended whilst auto updates were being carried out returned 24 hours later to see the hard disc light still blinking....

It is possible that the motherboard or one of your other devices (Drives, fans, video card) pulled down too much power and killed the supply, but it's far more likely that the supply was bad all by itself.

There's no way to remotely diagnose which part failed first, but if it were my system the first thing I'd do is buy a new power supply.

I haven't seen a 250W power supply in a long time -- is this an old computer or a modern system? Unless it's a specialized system that requires the smaller supply, I'd get a 400W supply or larger.

If it's an older system, make sure that the new power supply has the correct motherboard connections to work with your motherboard.

Oct 24, 2009 | Bestec (ATX-250-12E) 250-Watt Power Supply

2 Answers

Should i upgrade power supply and how much ?

watts is very small impulses of current, volts is a stead powerful current. If you are going to upgrade your power supply you just want to upgrade the watts to the next biggest which is 500watts.

Here is a link to a wattage caluculator to tell you how much you should have:

Jul 10, 2009 | Computers & Internet

3 Answers

What is a good replacement for the MGE 400W

all you have to do is swap it with another one with the same specs connectors and wattage, thats a good PSU, i'd replace it with 550 wats

Nov 27, 2008 | MGE 400W Power Supply (QG) Power Supply

1 Answer


Wouldn't like to try but the cables are the same and using the connectors in the correct formation you should be able to but risky.

Thanks J

Jan 30, 2008 | IBM Netfinity 400W H/S Redundant Power...

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