Laptop making noise when turned off

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A few questions...

You say even when it's switched off, does this mean it even makes a noise when the plug is removed from the electric wall socket?

Does the noise come out of the system speakers?

When does the noise stop?

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Probably something to do with your PSU [or motherboard].

When did this behavior start?

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Its an emachines EL1360 -UB10P. Its a normal desktop computer. The warrenty expired a couple of days ago

If it were me, I would first disconnect the a/c power cord, open the case and disconnect all the PSU power connectors from all devices including the motherboard. Then reconnect the a/c power cord and listen for the noise. This would isolate it down to the PSU if it still makes the noise and would probably have to be replaced. If there is no noise, I would disconnect the a/c power cord again and reconnect the power connectors to the motherboard. Repeat the process with each device adding them back one at a time until you hear the noise.

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I love @nikki605's suggestion

If it were me, I would first disconnect the a/c power cord, open the case and disconnect all the PSU power connectors from all devices including the motherboard. Then reconnect the a/c power cord and listen for the noise.

Also does it do this if you use the monitor's power cord in the computer?

how about on a different outlet?

if yes to both of these, bring it to Best Buy or Office Depot [and maybe Staples] as they will do a free check-up, tell them you thing the PSU is bad but you wanted to be sure [it'll make you look like you know enough for them not to BS you]. the PSU is an easily replaced part but if you have a dork like us that you know, he'll probably come by and change it for you for like ten-twenty dollars including going with you to buy the new one so you do it right [also the places i mentioned above will do the same for you, for a fee]

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you misunderstand, the buzzing well could be a problem,if left unchecked it could lead to PSU failure, or even damage your hardware. If you run those easy checks you could find out for sure. On top of that without running these checks, there's no way to be sure that it is, indeed, the PSU.

EDIT: when was the last time you cleaned the inside of the computer, dust bunnies can cause buzzing [and damage hardware]. Are there smokers [of any sort

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You should also double check your warranty.

Although it may have actually expired, a lot a retailers will still honour it, if it has expired by a very short time.

I assume it came with a 1 year manufacture's warranty, did you get an extended warranty per chance?

I once heard from a guy in that area that there is some sort of non-advertised law? / requirement? that they still have to honour warranty's up to something like 3 weeks past expiry.

[that's for Oz at least]

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A buzzing sound could be a bad transformer or possibly capacitor in the PSU. The fan shouldn't be running until the PC is powered up & booting. It might also be a bad earth ground at the power outlet. Either way it could be a sign of a pending failure.

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This Topic is seven years old.

Computers and their operating sytems have changed a lot since then.

Please start a new thread if you are having a problem.