Strange noise buzzing behind my Mac

Lately my Mac has been making a weird buzzing noise from behind the screen. It might be the fan or something, but I hate to say it, but I hit the back of the computer and the noise stops. It only happens after my computer sleeps overnight or for a long period of time and then when it starts up, it makes that noise again. I have been reading other posts about this noise, but not sure if anyone had the same solution as me that hitting a certain spot stops the noise. It has nothing to do with how many programs are open or if a certain one is open.
Has anyone had this problem and has anyone fixed theirs? I do not have the apple care warranty anymore, but not sure if there was an easier fix or if I should just take it in or if I just need to suck it up and do what I have been doing. Also, I am not sure if doing the hitting is going to damage my computer in the long run. Any help would be appreciated. Thanks.

I wouldn't keep hitting it; that could be quite bad for the drive if it's spinning. Could be a few things, but sounds like it might be a bad inverter, but you should at least bring it in for diagnosis for which there is usually no charge. When this is happening do you notice any difference in the screen? The inverter supplies AC current to power the fluorescent backlight of the screen. The buzzing noise maybe not very different from a buzzing fluorescent bulb.

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