|State the make and model of your brand name system, or if it is a generic system, the make and model of the desktop mboard. |
The specific brand name system model is usually on a label on the outside of the case somewhere, or it can be determined by going to the brand name's web site.
The model of the mboard in a generic system is usually printed in obvious larger characters on the surface of the mboard, often between the card slots.
Find the maker of the original PS on it's label and tell us what it is.
El-cheapo power supplies are a lot more likely to damage something else other than themselves when they fail like yours did. E.g. if the PS brand is BESTEC, the brand used in most emachines desktop computers and in some cheaper brand name system models, that's a lot more likely.
In any case, the switching power supplies used for computers have no large transformer for the AC voltage that is rectified into +12 volts DC. The controller chip on the board inside the PS rapidly switches the incoming AC power to provide the AC voltage that is rectified to become +12v, and relatively small sized transformers on the board transform that AC voltage to a lower voltage that is rectified to become +5v, and +3.3v.
If that controller chip goes wonky, or if components on the board fail, often it's one or more of the electrolytic capacitors that fail, the board can be briefly exposed to ten times the AC voltage that was supposed to be the voltage that is rectified into +12v before the PS fails completely, or something failing may have caused a short on the board, and in turn, the mboard or anything connected to it can be damaged because of that happening.
If your mboard is fried, that certainly could cause your problem if there is now a short on the mboard.
If there is a short on the mboard, your replacement PS is probably fried too from being connected to that mboard.
You could probably find a used mboard that is the same one on the web to replace it with, but in this case it's likely at least some of the components that were connected to the mboard when the original PS failed are damaged too.
SO - time for another system.
This was the original bad capacitor problem - has some example pictures.
History of why the exploding capacitors and which mboard makers were affected:
Defective electrolytic capacitors are still being made these days, and they're more likely to be used in el-cheapo power supplies.
Pictures of blown capacitors, other components - power supplies, Athlon cpu's, etc.:
We have noticed lately that people have been installing recent or fairly recent video cards that require your system has a PS with a greater capacity. Brand name builders are more likely to have a PS on a desktop system with a modest capacity that can't handle the video card's requirements.
Your power supply must have at least the minimum capacity required to support a system with the graphics card you are using installed, or the max graphics card you might install in the future.
(Onboard video - video built into the mboard - IS NOT A CARD!)
You can go to the video card maker's web site and look up the specs for the model - often under system requirements - the minimum PS wattage, and, more important, the minimum amperage the PS must supply at 12v is stated. If you don't find that, any card with the same video chipset including any letters after the model number has very similar minimum PS requirements.
Some power supplies have more than one +12v amperage rating - they have two - in that case you add the rated max amperages to determine the total +12v amperage rating.
A video card that requires more PS capacity than you system has often works for a while anyway, but the PS is overloaded 100% of the time and is eventually damaged and fails.