It's likely that the pin structure to let the television know that something is connected is misconfigured, and this is a common issue with several laptop manufacturers. I've seen a bit of this in the past years, and here's how this can be addressed:
1. Download the latest video driver. Many manufacturers have handled this issue that way.
If that doesn't work:
2. Download the latest BIOS for your computer. This is where the pin structure is updated to correctly run.
The VGA should be able to connect. If you see a message where it says "Mode Not Supported", change the resolution on the signal and you should be all set.
I have a Samsung 40 inch LCD, model LN-T4061F, that I purchased about two years ago from Sears. On the back of the tv it has a PC input and I am now wanting to hook my desktop to it, to use it as a monitor.
The input appears to be a VGA input(15 prong), I hooked up a VGA cable from the tv to my desktop but when I change the source on the tv it won't let me switch to PC. Is there something I need to do to turn on the PC input on the TV, or am i hooking it up wrong? Or is possible that the PC input on the tv is broken?