Gery,
Are you receiving signals okay?  And are there any fluorescent lights 
around?  And have you moved your ground connection?
Maybe those are starters.
Pat, K9JAUAt 11:53 AM 7/6/2009, you wrote:
>I have an icom 751, a butternut vertical and a dipole for 20 meters.  I rec=
>ently moved all of my things into my new ham shack.  I have 2 computers, a =
>refrigerator, an window unit air conditioner and my radio.  When I turn on =
>my rig I hear static similar to the noise you hear when you hear engine noi=
>se through a radio.  Only difference is that the pitch of the noise doesn't=
>  change.  It seems to be more noticeable when you are on the lower bands sa=
>y 80 or 160 meters but it is present on all bands.  I tried moving the rig =
>and turning various things off, also tried both antennas and still the same=
>  thing.  Any thoughts or ideas?