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Need a power supply to replace a Dynex DX-PS400W

My electricity went out during a storm and when it came back on my computer would not power on. I tried another power outlet and power cord, but no luck. Nothing on the computer comes on. They don't make the Dynex DX-PS400W power supply any more and I need to know if I can use a Dynex DX-PS400WS power supply or a HP power supply P/N 5188-2859 with a 24 pin to 20 pin adapter motherboard plug to replace the one they don't make anymore. My motherboard has a 20 pin plug (ATX) and it's in a HP Pavillion a720n. Any help would be appreciated. Thanks

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  • jtjet Sep 15, 2008

    Can I use a 24 pin power supply with the 20 pin adapter?

  • jtjet Sep 15, 2008

    My additional four pins did not detach, so I covered them and slipped the 24 pin plug right down into the 20 pin socket on the motherboard with the four additional pins hanging out over the end of the socket. Up and running again. Thanks for your help.

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Any power supply with the same pins will do. Just choose a good brand and with same rating or better higher(400 watts or more).

Posted on Sep 15, 2008

  • Kirk Philipson Chan Sep 15, 2008

    Yes. Most 24 pin power supplies, you can actually take-off the additional four pins. That's what im using. My board is 20 pin so i took off the four pins.

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1 Answer

Should the power supply's fan run when you plug it in to the outlet?


Yes it should. I'm assuming it is new so get it exchanged under warranty.
Hope this information will help.

Your response is very much appreciated...Thank you for using Fixya...

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Will this replace the dynex dx-ps400w2 power supply


  • Yes.
  • Please reply if you have any more questions. Good luck, Cooper. (Please give a thumbs up, I am doing this for a summer job!)

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Lightning storm & power went out for about two seconds. PC plugged into surge protector but would not go back on. Found that surge protector blew and was no good. Got another and plugged all back in...


Your reasoning about the switch mode power supply being damaged is probably right.
Bear in mind that this power supply may not be the only thing that may be damaged in your computer.
You won't know for sure until you borrow a power supply and install it into your computer to see if it will work again.

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Hear a peep after installing it


the beeps are post during post the very first work is done by the ram,all the memory in the ram is first transferred to the hard disk,and remains active untill turned off.
make sure that your RAM is securely seated
test or replace all the leads that attach to your hard drive make sure the connections are secure including electrical extensions + IDE,SATA the ones that attach from your
((motherboard to hard drive))
make sure all leads that are attached to your drives dvd\cd 3 1/2 inch floppy have secure connections and are not faulty or just replace them they are probably old and faulty ?
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don

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1 Answer

The fuse is blown and the Model DX-PS350W is discontinued - what other power supply can I purchase that is compatible


you can use about any power supply you want as long as the physical size is the same. stay away from the really cheap ones. they weigh half of what a good one does and they cause problems with the computer. i did see amazo has a 400 watt Dynex on sale now, here is the link
http://www.amazon.com/Dynex-DX-PS350W-350-Watt-Power-Supply/dp/B000EVOOWA

also newegg.com is a trusted site to buy computer parts they sell the cheap ones as well as the top of the line and most all have user reviews.

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My old power supply had 4 wires going to the front panel on\off switch. The Dynex power supply does not support the switch. what do I use to turn the unit on or off. Will the unit function with out the...


Normally the front panel on/off power button and the front panel reset button plug into connector pins on your motherboard.

If you can find a User Manual for your motherboard it will show you exactly where the switch leads plug in on the motherboard. The motherboard's manufacturer and model number will be printed on the board somewhere.


Good luck.

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Buy one


You can buy it at any computer store in your place.

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Were can i buy an intel inside pentium 4, model number DXPS300w POWER SUPPLY?


I always buy power supplies from ebay. They are cheaper and good. If you order it from dell it's gona cost you an arm and a leg here is the link i have bought them.

http://shop.ebay.com/i.html?_nkw=dell+dps+300w+&_cqr=true&_nkwusc=dell+DXPS+300w&_rdc=1

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