My MacBook Air will not show up on my Sony HD tv

I have purchased the mini display VGA adapter for my macbook.
As i plug it into my sony tv i push the input button for the tv bringing up the list of inputs.
However the PC option is not hilighted as if there was nothing connected.
Any suggestions?

My laptop is plugged in. I'm running Yosemite. The Lacie drive does show up in the disk utility, I've done repair, etc. Everything shows up fine. It still won't mount when I clicked the mount option. I get the message "Mount failed. The disk LaCie could not be mounted. Try running First Aid on the disk and then retry mounting." I've done the first aid; doesn't help; still same message. Then it told me it couldn't be mounted because there was no mount point. I'm not sure what a mount point is. Both desktop and laptop are the latest version. It always worked on both machines before last night.

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