Computer pings when locked

[thatrenowned]

For some reason, a user's computer starts pinging every few seconds (ping as in noise, not network ping) when its locked. As soon as it unlocked, it stops.

I had fixed it before by replacing the keyboard but now its back which makes me think that it probably wasn't the keyboard (just a coincidence?).

Has anybody had this problem before?

Thanks

 

[wolluf]

Never seen (sorry, heard) that. Where is sound coming from (PC speaker, soundcard speaker, just somewhere internally)?

 

[thatrenowned]

Definately the sound card because when you mute it in volume control, the 'pinging' goes away. Anyway I just thought, the pinging noise is the 'ding.wav' file.

 

[TheLad]

Does it go into screensaver? If so, does it do it on all screensavers?

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"It's true, its damn true!"
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[thatrenowned]

It happens when the computer is locked, either manually or when the screensaver is invoked. This is the only computer it happens on...

I've scanned for viruses which turned up clean (bit of a pointless virus if it was one...)

I'm still thinking it could have something to do with the keyboard, because when you lock a computer and hit a key, it makes the ping noise. However, even when holding the key down, it doesn't do it continuously...

Strange one this...