High Pitch Noise through Headphones

Ok. Hit a bit of a snag on the weekend when I was getting my shit ready to head out to a gig.

Went to do a quick test before leaving the house, plugged in my DDJT1 to my Macbook Air. Nothing. Didn't recognise it. After a bit of headscratching and a few tests I discovered the USB port had died. Lucky me (I have an older MBA with only 1 USB port). This was strange enough considering the USB port had worked only 5 minutes prior. Oh well. I was getting a new computer soon anyway, not worth stressing about. Luckily I have a Dell Laptop I can use for my gig that evening . Or so I thought.

This is where the problems started. Now I already have Traktor installed on this PC for this exact scenario, so I packed up and left, believeing I'd avoided all my problems and just had to deal with a heavier and more poorly built laptop for the evening . Anyway, I setup mixed my first couple of tunes no dramas when bam the headphones let out this hideous high pitched noise, turned them down and it stops the noise, but they no longer function to Cue. Anyway I went about mixing for 30-40 minutes without headphones, thank god for sync and a decent knowledge of my tunes.

During the evening I get an hour or so to have a rest or whatever while a band is on, anyway while this was happening I went through all my settings, checked my routing, adjusted latency, re-booted, plugged and unplugged but no matter what after varying time levels (sometimes 30 seconds sometimes 2-3 minutes) the noise returns... So I finished the evening Steve Angello style by mixing with sync and waveforms...


Anyone have any ideas? I've used this laptop before with out these problems showing up? A quick google search suggested rolling back Traktor to 2.6... I'd like to avoid this if possible.. and it seems like a pretty shitty solution... Off memory the collection files aren't backwards compatible? Or am I wrong there?