I have a Latitude CPx J650GT running win2k server. The audio works fine until one day, it emit continuous very high frequency sound (sort of like smoke detector, but higher frequency) from speakers during the boot time and the sound persists till I shut it down. The volume control works because it could lower the high pitch's volume. No other audio could be heard when I tried to play some audio file. I don't think this is a driver issue because I updated the driver and it used to work fine. I rebooted it and it gave me the same high pitch sound.
I switched to use a different Power adapter, and it works fine now. Then I used the adapter (which caused the high pitch sound) on a different Latitude (running win 98SE), it works normal. I don't know if the Power adaptor has anything to do with it. The same adaptor used to work fine for this laptop (for all my dell laptops). Can someone explain to me that happened?
I had a similar intermittent problem 2 years ago with a CPxJ, but in my case it was short duration during boot or resume from standby. It was fixed by updating the BIOS.
Download the latest files and flash the BIOS. If this doesn't fix the problem please post back.
I upgraded my BIOS to A22 (BIOS Date 11-7-02) in December and this upgrade DID NOT solve my problem which is similar to the one described. I also updated the audio driver at the same time. I have a Dell Lat C600 running Windows 2000 Professional.
I continue to have an intermittent problem with a high pitched "firm alarm" sound being emitted from the speakers. It happens occasionally when I resume from stand by. It has happened once while I was actually using the computer. The noise always goes away if I reboot and may or may not go away if I go to stand by and then resume. When the noise is emitted, everything else with the computer operates normally--even volume control and mute.
Additionally sometimes when I resume from stand by (having normal sound operations when I went to stand by--no alarm noise) I have NO sound and must reboot to get sound. It I got to stand by and resume sometimes the sound will return, but usually not. This "no sound" problem happens much more often than the alarm noise--maybe even daily.
I'm guessing these issues are related. Although they diligently tried, Dell Phone Support couldn't offer any help with the matter during a lengthy phone call.
Any ideas? Thanks!!