I'm a new user....and I think that I may have jumped the gun. Is ROKU involved/necessary to connect a PC or MAC to the internet and have my TV (older/pre-HiDef model) linked for a lager picture. I thought that in addition to connecting to NetFlix, Pandora, etc, that my PC could also connect/stream through the ROKU device via my WiFi connection. Is this possible or do I need to get a new HDTV to have my PC connected to & streaming to the TV?