Weird Thing after I lift my ground.

Follow-up to what I wrote previously:

This past weekend I bought and installed the MAGIC Box and the aforementioned hum disappeared. So the MAGIC works in my particular installation.

If a cable tv input is part of your system, then the ground loop is usually caused by the ground of the cable system being at a different potential than the electrical ground (see page 115 of the current issue of Stereophile [June?]).
Remove the cable connection at the input. If the hum disappears, then go buy the MAGIC box or MAGIC Splitter.
(No, I do not work for MONDIAL, but I have spoken to Paul Rosenberg, who told me the above. And yes, my hum also was caused by the same thing. And it disappeared when I disconnected the cable connection.

Ground loop hum is much more easily solved by disconnecting the ground sheild of any cable TV line, and by having all your components plugged into the same outlet (thus on the same ground). Lifting the ground on all your hardware is a recipe for disaster.

I had some of the same problems, mostly amp hum that would not go away even with power conditioning, so I ran a dedicated 10 awg 30 amp circuit with isolated ground to a
8 foot rod in the ground. Now all hum is gone and I don't even seem to need power conditioning.

I guess I agree also. There are a couple digital power conditioners on the market that include a ground tester with the unit, because the conditioner won't work if the ground is not OK.

Your digital gear is telling you that you did something that was not kosher. By lifting ground you are depending on the connection between neutral and earth ground all the way back at the box. IF there is resistance between earth and neutral because of a long run of house wiring anything can happen. The best thing to do is to use the cheater plugs and tie the grounds of all the equipment together at one point and then to your outlet's ground. BTW a good test to see if your outlet is wired correctly and that neutral and ground are connected well at the box is to measure the AC voltage between Neutral and Ground under load. It should be close to Zero volts. If it is not zero either your ground or neutral has some resistance and should be looked into.

I had a Theta DAC at one time and they specifically stated in the manual to never lift the ground. Digital components generate a lot of noise and some depend on the ground to control this noise. Why are using the cheater plugs? Sometimes a hum problem can be overcome by doing this, but I would recommend doing this only as a last resort.

I'll take a shot at this. Please don't quote me on it. I believe that digital equipment uses ground as a reference. I base this on my expierences correcting power problems in data systems. Neutral and ground must be equal potential or data error can happen. I don't know why you lifted the grounds. I don't believe in this practice. You may need to have your branch circut wiring looked at. Good luck!