Solved Replaced my PSU but the new one is too powerful

February 2, 2014 at 04:07:03
Specs: Windows 7
My computer wouldn't switch on so I borrowed a PSU from work to ensure this was the problem.
I then purchased a new power supply - 500w - but using this I get no output to my monitor (or tv) but all works well with the one I borrowed from work - 350w - (except this one will not fit into my computer!)
How do I know which power supply to buy next? Or is there any way I can reduce the power on the supply I bought?

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February 2, 2014 at 04:19:49
Hi Ginger,

it sounds as if the 500 watt psu you purchased is an incorrect type for your computer. Same for the work one, as it does not fit in your pc.

If you advise the make and model of your computer (if unknown, advise the mobo's model number), someone here will advise you which type of psu you require.

Also advise the make, model number, and wattage of the failed psu.

When purchasing a psu, the type should be the same as the one it is replacing, and the wattage the same or (preferably) greater than before. If the wattage is less, it may not be enough.

Regarding the old psu, if nothing starts, it is worth opening it up and blowing out any muck with a hairdryer set to cold and maximum blast. Also clean its fan. Generally there is a small internal fuse, that you should also check is ok.

Good Luck - Keep us posted.

message edited by Mike Newcomb

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February 2, 2014 at 05:18:29
There is no such thing a a power supply that is to powerful. As long as the voltages are correct the computer will draw just as much power as it needs and not a milliamp more.

You have simply got the wrong type for your computer. Ggive us the information requested by Mike Newcomb and we should be able to recommend a suitbale PSU


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February 2, 2014 at 05:53:05
✔ Best Answer
Confirmed. The power supply would work if it was a 1000 watt model as long as it fits your case, has the correct input and output voltages, the correct connectors, and meets the minimum requirements of the system. Avoid cheap powers supplies since they do not supply what is listed and can damage your system if/when they go out of specs far enough.

Did you look to see if the input voltage switch (if there is one) is set correctly? Most power supplies are sold internationally with the substitution of the power cord and have a select switch that says "120/240" or similar (120Volt for US/Canada and 240Volt for Europe and many others) and this must be set to the local voltage for your country.

As mentioned, post specs for more info.

You have to be a little bit crazy to keep you from going insane.

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February 2, 2014 at 06:10:52
Please post the make/model of your computer & make/model of the 500W PSU you purchased.

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