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"Ground lifting" to eliminate noise from Computer

I heard a hum/static through my monitors and headphones when using my Firepod... After a while, I eventually traced the problem to the power adaptor for my Laptop. When plugged in, there is a hum, and when not plugged in there isn't. This must be due to the ground... therefore, I'm trying to figure out the best way to solve this problem.

ART Pro Channel Preamp Tube replacements

I have had this ART Pro Channel in my studio for years now and I would like to breath some new life into it. I ordered and installed Ei 12AX7 Elites and TungSol 12AX7 [ NEW PRODUCTION] tubes only to find that both had issues. The Ei's had +17 dB noisefloor over baseline factory tube. The TungSol tube has a bad harmonic distortion at about 300hz.

Cant get midi to work in new 003 Rack - spot the newby!

I have a cheap midi keyboard CME U-KEY powered by USB from my new mac Pro, and connected to the 003 from its midi out to the rack's midi in port. there are noises coming from the mac's internal speaker, so the usb connection is working OK, but within pro tools, whilst it mostly recognises there is a midi signal coming in, i cannot get any sound out of pro tools, and cannot load any 'patches'.