This has absolutely nothing to do with the Slingbox, it is your TV that needs changing. It is fitted with a system that will switch it on when it senses a video signal on the HDMI cable. The same thing would happen if you were in California and turned on your cable/satellite with the real remote. You need to get into the TV Setup to disable it. Is there anyone local that could do it for you ?
I am overseas and able to watch my sling box that is located in California. The glitch I want to correct is when I log into SB and watch it from where I am, the local TV (CA) where the SB is physically installed, switches on the same TV.
When I watch SB, I do not want the local TV to switch on. Is there a setting within my SB 500 for preventing this ?