Question about Dell - NPS-200PB-73M (NPS200PB73M) Power Supply

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Pc won't turn on

Emachine 410. was left on all day, when i returned i found that pc had switched itself off. when i tried to turn it back on the three lights on keyboard, num lock, cap lock and scroll lock all on and the machine made a funny noise and won't switch on.

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Re: pc won't turn on

Same problem. My sons PC was on all night an he noticed several days later when he tried to use it it would not turn on.
I removed the power supply and tried to power it externally but to no avail. I checked the fuse which was still fine.
Does the power supply have some feed back from the mother board in order to start up via one of the harness cables?

emachine 410. was left on all day, when i returned i found that pc had switched itself off. when i tried to turn it back on the three lights on keyboard, num lock, cap lock and scroll lock all on and the machine made a funny noise and won't switch on.

Posted on Feb 23, 2008

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Re: pc won't turn on

I just learned, the hard way of course, that Bestec power supplies, especially the 250w model supplied with desktops by eMachines and some from HP, frequently blow out the motherboard when they fail. Try googling "bestec power supply fail emachines motherboard" (without quotes). No real useful suggestions there, just a lot of ranting about how eMachines and Bestec are crummy, but it gives you an idea of how prevalent this problem is.

Posted on Jan 06, 2008

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Re: pc won't turn on

Power supply failures are very common due to cheap components. PS testers are cheap ( about $5 ) and available on eBay as well as component suppliers. There are many different voltages and connectors coming out of the supply and if any of them are bad your computer may not power up. The testor may show all lines good when the MB connector is plugged in but when you put a load on it ( plug in another connector like the 4 prong drive supply line ) it will fail. There is also a "power good" line on the 20 - 24 pin MB supply that will not allow the MB to power up if values are not in an acceptable range. I recently had a late model Dell Dimension that would not start and the supply tested good with the 24 pin MB connector plugged in - Drive connector plugged in, still good - p4 connector plugged in and bingo - failuire! Replaced the PS supply and all good! Point being that while PS problems are only one of many that may cause a no boot situation, it is the most common and not always obvious.

Posted on Jan 04, 2008

Re: pc won't turn on

Remove capacitors, big one

Posted on Dec 15, 2007

Re: pc won't turn on

I sorted the problem and thanks to all that replied. I've bought a new PC! Easily solved.

Posted on Nov 04, 2007

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Re: pc won't turn on

My power supply failed i started tinkerin around with it and found that the connector that goes to the board from the swich, one of the wires where half way pulled out. Found it when i stuck the ohm meter in the back of the conector and it sparked. unpluged it then pushed the wire back into its connector. Pluged the power supply back into the wall Jumped the Green wire to a black ground "all blacks are ground" fired right up

Posted on Oct 23, 2007

Re: pc won't turn on

You don't need anything except a 300 watt power supply thts all

Posted on Sep 08, 2007

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Re: pc won't turn on

Hi, Are you able to test or repair some of this your self? is so use a multimeter and check the power supply,If you get no reading then remove the unit and open the cover, on the printed circut you will find a fuse either glass or ceramic. Replace this and also clean all dust from the unit replace the cover and reinstall in computer. If this fails you may need a new power supply unit. Regards mistyman

Posted on Sep 08, 2007

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If you do not have a multimeter it will be very difficult for you to figure it out. If you do get back to me and I can help walk you through some steps. Otherwise, buy a new power supply, would not be worth paying someone to fix.

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Your Power supply is most likely dead.

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Hello there martinsjak.

Here's your GEEK-steer ...

First, I'll presume you have of course "lamp-tested" the wall power outlet, as well as the power strip outlet you using, and that also the power cord is in good repair.

With that out of the way, kudos are in order, because your suspicion of the Power Supply Unit (PSU) is very well founded. It is THE most common PC component to fail. Although it could also be the case power button/switch itself, it's likeliest to be the PSU. But regardless of which, the easiest way to find out is to test the PSU.

You have three options:
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  2. Install the suspect PSU into a KNOWN GOOD working PC. If the PC powers up, you know the PSU works. If not ... well you get the picture.
  3. Test it using a PSU Tester. This is a surprisingly desirable option. Why? Because PSU testers are not very expensive, and if you're like most everyone else in this modern era, you'll be in need of testing more than just this one over the course of time. Check out this very solid choice for a Coolmax PS-224 ATX Power Supply Tester.
Which of the above three is your call. Easy-peasy, yeah?

Good luck to you, and thanks for posting back ...
  • to let me (and others) know how things worked out,
  • if you have any further questions,
  • to provide clarification or feedback.
"Today's the best day of my life ... and NOW you're part of it!"
Via-con-Dios and Godspeed -- Craig

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5. Turn the computer on

Also check the condition of the USB ports if it doesnt work and the fuse. If this doesnt work then I would recommend a repair.

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