Hey, I have purchased a mini-dvi to dvi cable and then a dvi to vga cable to connect my macbook to my tv. I've plugged it all in and it wont appear on the tv? It keeps saying no signal. I tried this on my 40" Sony Bravia TV and it didn't work so I switched to HDMI but I bought it to use on my 16" tele I have at uni. It had a VGA and Scart but no HDMI so is there a shortcut I need to press on the keyboard to send the image on my laptop to the tv screen? PLEEAASSEEE HELP!