My Harmon Kardon speakers are securely plugged into my Dell PC tower using the green jack, however they regularly require the on/off volume wheel to be jiggled with to get volume to kick in on videos which I play on my PC - this is any videos, be they on Youtube, Facebook or news sites).

Volume cuts in & out periodically, & when this happens I note the green power light on the main HK206 speaker (the right one which houses the main connection to the PC & mains power) flickers & dims, until I turn up the volume & down again until it kicks in again.
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Hello all - its banchang here !