VGA is analog only and HDMI is digital only, and there is nothing in common between them.
If you have VGA on your TV you could use a VGA cable. If you have DVI on your computer you could use a DVI to HDMI cable. But if your computer only has VGA and your TV does not, you would need a "VGA to HDMI converter" (not a simple adapter cable).
The HDTV's HDMI ports require a DIGITAL video signal.
VGA ports on computers and laptops can only send out an ANALOG video signal.
Digital is NOT compatible with Analog, no matter what cable adapters you try to use.
That is why you CANNOT directly connect a computer VGA port to a display's HDMI port-- If you tried, you will get no image.
Check to see if your TV has a VGA connection (most do) - if so you do need to go VGA to VGA