I see that you are having difficulties establishing a network connection on the Slingbox while you use SlingLinks for the installation. Have a look at these pages, they'll help you verify that everything is hooked up properly and the electrical interference is not the problem.
sounds like you need to order a new power supply. i had the same problem and after much time searching around, including this forum, it turned out that a lot of other people have had issues with bad power supplies which caused this problem and the only way to fix it is with a new one found here:
SLINGBOX PRO-HD/SOLO AND SLINGCATCHER POWER SUPPLY