Thanks for update, but LOL!
A $200 line conditioner for a $100 adapter. For $100 Apple should have shielded the cable better? For 1.5 years, with all the same wires behind my desk, with the exception of me swapping out my PowerMac G5 for a Macbook Pro, the 30" never got interference. Only since the mini-display port has this happened.
Here is my ********, workaround, unacceptable solution. My laptop is set to lock the screen when it sleeps or screensaver comes on. Since the static only ever happens when the display comes back from screensaver or sleep, if the password dialog is all messed up and full of static, I press the Esc-key. It puts the display back to sleep or in the screensaver mode and I try again. This usually solves the static on the first try, but I've to repeat once or twice.
BARF!