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Replace power supply on Dell Vostro 220s pc

I'm going to be replacing a power supply and I wanted to know how to do this as well as to how to troubleshoot if this does not reboot the pc?  When I plugged in the computer, after it smelled "burned", I could not power on the pc and the fan also did not start.  I did see an AMBER light in front of the PC and I was told that this meant that I needed to replace the power supply, but what if after the replacement, it still does not power up?

1 Solution
Gerwin Jansen, EE MVETopic Advisor Commented:
>> I wanted to know how to do this
Dell systems are built very modular. Just order a new power supply from Dell and replace it. Disconnect power chord, disconnect all cables internally from the PC, replace it and reseat all cables again.

>> but what if after the replacement, it still does not power up?
There is no way to tell this upfront, your new power supply may work or not. If it doesn't work then you have other issues. In that case you may have to contact Dell.
you can take out the psu (power supply unit), unplug from everything and use a metal wire as a "jumper" between the green wire on the 20\24pin connector to one of the black ones.

connect the psu (only) to the wall, without connecting any computer part to it.

if the fan is running, the psu is working. how well? you can't know.

anyway your slim case require a smaller than usual psu, you can get it from dell.com/parts.

good luck!
Replacing a power supply with a similar unit is just a matter of disconnecting the different leads to the motherboard, hard drives, and possibly the video card.  Unscrew the screws that hold the power supply in place and install the new unit.  Plug all the cables back in to the places that had them connected and you are done.

If it doesn't solve the problem, it is possible that when a power supply blows up, it passes a surge to everything that is connected to it.  At this point, motherboard, video card, RAM, and hard drives would need to be tested independently.
Unfortunately, if a light comes on, most likely its not an issue with the power supply. Its probably the motherboard.  I wouldn't recommend spending money on a PS on that off chance.  I looked up that computer, it appears to be a new model.  Have you looked into the manufacturer's warranty?  
>>  but what if after the replacement, it still does not power up  <<  GOOD question
the PS is the first suspect, but not the only one; in many cases a bad PS corrupts the mobo also, so inspect it closely for burnt marks, leaking or swollen capacitors (most arund the cpu)

my articles can help you troubleshoot :
http://www.experts-exchange.com/Hardware/Components/Motherboards/A_1945.html      (Short-overview-of-how-to-troubleshoot-bad-hardware-when-a-pc-does-not-post)


i found one here :  http://www.discountelectronics.com/index.php?l=product_list&c=5698

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