High-pitched beep/sound during sleep and shut down modes

[Huanwei]

I just wish to check whether is it normal that there's high pitched beep (not very loud but can be heard in a quiet room) which seems to be from the LED or AC Adapter during sleep mode. The beep sounds continuous when the computer has been shut down or in off mode while the main plug of where the ac adapter is connected to is still on. Is this normal? My computer works fine. Battery is charging fine. I just want check whether is this normal. It is has been like that ever since I bought my computer on March 2012.
HP Pavilion dm4-3005tx Entertainment Notebook PC

[Futoji]

Hello Huanwei,

It appears that you can hear a "high pitched beep" coming from the notebook while it's in sleep mode or even off, when the power adapter is plugged in and "on". I will try to help you with this.

Normally, this should not happen. Beeping from a computer may happen during start up a few times to indicate components enabling, but any constant beeping or being while the computer is off shouldn't happen.

Does this occur, if the AC adapter is not connected to the notebook when it is in sleep mode or off? Do you only notices this, in a specific location? (office, etc.)

I would suggest, depending on the setup of things. Taking the notebook with no AC to another location in the house. A quiet one, make sure your not near any other electronics (no watches or cell phones either) let the notebook sleep and see if you hear the beeping. If not, then power it off and test again. If no beeping, this is good and the notebook is fine.

Repeat that same test with the power adapter connected ( again no other electronics around you). Listen while it is "sleeping" and off to see if you can hear the beeping again.
If you do disconnect the AC from the notebook , but leave that connected to the wall and take the notebook out of that location, go back to see if you can hear beeps again. If you do it could be the AC adapter. If you don't then it could be an issue with that only when it's connected.
If there was no beeping when the AC was connected in this "testing location", then I would guess it is something else within the house that is beeping (we have seen that before). In which case you'd have nothing to worry about in regard to your notebook.

Let me know where the above leads.
Thank you for posting on the HP Forums. 🙂

[Huanwei]

It is not that kind of beep like you've mentioned "beeping from a computer may happen during start up a few times to indicate components enabling". Also, my laptop doesn't beep on startup. Not all computer beep on startup. Depends on how they're designed. Like my custom made desktop compputer with no brand beeps during startup. It's a kind of beep softer and higher pitched than that kind of startup beep. It only happens when it is connected to the ac adapter (on) and laptop in sleep or off mode not running on battery. I think my laptop is fine. Also maybe I've sharper ears and can hear such frequency of sound not many can hear. Usually, younger people can hear higher pitched sound from things around. The ability becomes ineffective as people grow older.

[Futoji]

Hi,

It is possible the noise your hearing is completely normal then, the only way to test is to try another power adapter. To test you could get away with just any adapter that's able to power the notebook on (just don't run the notebook on one with in correct voltage). If you hear the same noise, I would only guess it to be normal. If you don't, then it was the other AC adapter, which you should replace.

Thanks for your reply.