I install iDeneb 10.5.5 on my Asus notebook A8Jp. I have problem with sound "pop" Do anyone have something like my case?

Example. If i go to youtube site flash my sound "pop" or scroll webpage on web browser with listen music it's "pop" watch the movie on quicktime is pop too.(but it's lesss than normal) use iTunes to listen music only is fine. So i try to test on external sound card the result is same use Azalia. Someone give me advice please.. :hack:

A8jp System
CPU - Intel C2D 1.83 G (T5600)
Memory - 2G DDR2
Audio - AD1986a on ICH7 - use Azalia
Graphics - ATI mobility X1700 - QE/CI Working on 1280x800


Thank.
Best Regard.