Laptop + Wireless Guitar = Bzzt

[MetaCipher]

I have a HP Compaq nx9420 laptop and an Audio Technica DR-1500 Wireless Guitar System running with a frequency of 169.505 MHz. Whenever I turn my computer on, or turn it off, it causes about 1-2 seconds of interference making a bzzt noise. Because of the nature of the setup, I cannot simply mute that channel and then turn on/off my computer. I have been simply grabbing my laptop, leaving the room, and then turning it off when I am a good distance away (or turning it on before I anywhere near the Wireless Guitar System). (If you're curious, this is at Church worship service). Also, they have this channel pretty loud, so when the bzzt happens you feel like you've gotten struck by lightening or something.

My first assumption is that it has to do with the CPU, as WiFi is an a much higher freq, and it's not even turned on. BlueTooth, I am not sure, as I assumed BlueTooth is managed by an OS, and not turned on until after initial booting. The distance between the two is about 2-3 feet. Also, when I turn on my laptop it's not connected to a power source.

Any help is appreciated. Thanks!

[joed]

Computer have a lot of different frequencies going on inside them, power supply, disk drives, CPU, fans, wireless network, etc. Any one of them could be interfereing. Can you not leave the laptop on for the entire service?

[Mr T]

Put something in the CD rom drive. They seem to be the leakiest componets.
If you get the noise as it seeks and spins then try leaving the drive open when you boot it or have church in session and it should stay quiet. Most computers will hit the drive when they boot up and shut down (if it has a power drive drawer it would be closing it then). You could have some fun with this. If you have a firey sermon goin on just click the drive shut at the right time.. wont be any sleepers in church anymore! Ive seen cell phones ringing cause cd players to skip before.

The other common leaky componet is the high voltage supply for the backlight on your screen. Try shutting the screen off (Fn + a function key). That should kill the backlight too. If thats the case you may have to use a external monitor.

Bluetooth runs at a few Gig's.. Hard drives are heavily shielded. Not much else runs at that low of a frequency in a computer on a intermittent basis.