Hey ocau .. long time no see Thought I'd share a quick hack I did. I found the Headphone jack on my Antec 300 case produced interference, this quick midnight-snack 10 minute jobbie fixed it up good and proper. A quick google suggests other cases may suffer this. Weather or not it does and if the same fix will work for other cases I can't say, thats for you to investigate on your own, but if you're aiming to fix a crackly headphone jack like I then this might be worth checking out. Background if anyone cares I have an Antec 300 case, and until this evening I had run a 3.5 lead to the rear of the computer for my headphones. All worked fine and sounded good. However I decided I'd like to use the front output on the case for my headphones, so I can venture a little further without having to take them off, and free up a 3.5mm lead I needed (i had 2 linked with a joiner for length to reach around desk). I have an X58 board, i7, HD4870x2 and 4 hdd's so this case is crammed, so only now did I bother to pull the lead through and plug it in. Did that all good, plug in my headphones and oah! Interference city! Started up some music and it sounded fine, but quiet or no sound would have a moderate buzzing and popping clearly audible. Really annoying. It couldn't be a sound card issue because using the rear output worked perfectly. This might be obvious to some people, but maybe not everyone so I'll say it anyway. The problem is additional earthing. Out of curiosity and knowing earthing issues can cause all sorts of headaches (cars heh) I connected a multimeter to the case and the outmost socket of the headphone jack, checking resistance. Clear connection. Same for the USB plugs. To test further I unplugged the plug to the sound card. Same thing. Unplugged the USB header plug. Still earthing. There is a small wire that leads over to the case and screws in, obv a ground, removed, no more connection. Check continuity between the Headphone jack and the earths on the USB, clear path. So it was obvious Antec, in addition to the standard earthing lead from the headphone jack to the sound card plug, ran a 2nd earth wire which essentially just grounded straight out to the case chassis. Since I had nothing to lose, figuring I'd just abandon it and go back to the other cord, I cracked open the case with the audio jacks and usb ports, removed the earthing, plugged everything and voila! perfect sound with no interference at all. Mmmm how? Pretty easy. Turn off computer and unplug the USB and Audio headers. Take off the front of the case, and remove the plastic casing which houses all the front panel sockets. The case is pretty well sealed, upon observation the top just seems to clip in somehow, and also holds the sockets in place. However there was nothing less than brute force that was able remove the top, I snapped mine a bit, but couldn't find a more graceful way of doing it. I used a small jewelers flathead screwdriver for leverage, using the headphone jack as a pivot. Once lifted, stick another driver in to hold it and do the same using the Mic jack. From there it should be enough to pry with your fingers. Avoid levering against the USB sockets, the metal surround on these is very weak and bends easily. If you've a different case you're on your own Excuse the poorish pics, bad lighting, was just quick and dirty. Click to view full size! See the orange wires that solders to the side of the left-most USB socket? One goes to the other USB socket,which then connects to a black wire that runs to the case chassis. The other runs under the cables exiting the casing to the right hand side where the headphone and microphone jacks are. Click to view full size! So again in essence the jacks have 2 earths - one wire that runs to the sound card, and antec's bright idea that runs to the chassis. The latter is causing our interference problems, so all we gotta do is cut this orange wire to isolate the jacks. Click to view full size! Snip! Now the Mic and Headphone jacks will be forced to earth (as they're meant to) through the sound card and not directly to the case chassis. The USB ports will still earth as before, not that it's essential either. Put the case back together best you can, mine still seemed to click closed OK even though I had to break it to open it. Put everything back together, plug in the USB and Audio plugs, and test it out!