Cant get any sound from my monitor with our new comcast HDMI cables. Someone said we need a VGA cable??

so it has power ?
is p.c ?vga display output ?
https://en.wikipedia.org/wiki/VGA_connector
is monitor vga input ?
or is p.c only hdmi output ?
https://en.wikipedia.org/wiki/HDMI

if vga on both you need a vga cable
if hdmi on both you need a hdmi cable
if pc is VGA and the monitor is hdmi then an adapter is needed
if p.c is hmdi and monitor is vga then an adapter is needed

suggest figure out video cable standards and then decide on what you need
as shop will need to know what standards are used VGA or HDMI ?

Use VGA adapter to HDMI works for video
Sound is carried over stereo cable
What you are doing needs 2 cables
Video cable for video
Sound cable for sound
Using TV for monitor VGA to HDMI 32" at 120 refresh is best dot pitch .
over 32" dot pitch is lower may become grainy resolve place monitor away more from you when using over 32" TV 120 refresh is important

First of, a little bit of explanation.
VGA = analogue
HDMI = digital

The answer seems to be in your question.
it reads "VGA to HDMI". These cables or adapters doesn't work the other way around. I am guessing your cable can only support vga output to HDMI input. And your setup is HDMI output from your computer to vga input to your monitor.
Solution:
Try and find HDMI to VGA cable or adapter. This is expensive.
If your computer has a vga output, use this with vga to vga. You won't get a better resolution by using HDMI to vga.
Or are you stuck with only HDMI output?
There are adapters for USB to VGA too. This could be less expensive. I have one for my friends Apple Air. I am not a "i" fan so I do not have much experience on Apple.

Hope this helps.

Connection the monitor depends on the connections you have out of your Toshiba laptop.

The monitor has both VGA and DVI.

If the Toshiba has a VGA out, all you need is a VGA cable available online, computer or electronics store.

If the Toshiba has an HDMI out, you can connect it to the DVI on the monitor with an HDMI cable and an HDMI to DVI Adapter.

You can also use USB out with either a VGA converter or a DVI converter (go with DVI for the better picture). Converters can be found online at Amazon, you may also need a standard male to male DVI cable to use with the converter.

Amazon com uxcell Black Blue VGA 15 Pin Male to Male Plug Computer Monitor...
Amazon com 5m High Speed HDMI Cable Ultra HD 4k 2k HDMI Cable HDMI to HDMI...
Amazon com Rankie Gold Plated DVI to HDMI HDTV Male to Female Adapter...
Amazon com StarTech com USB to DVI External Video Card Multi Monitor...

you need a cable. it may be the one that usually connects a computer to a monitor = depending what the input is on the projector but it sounds like an ordinary monitor cable as projector is VGA ( the other type has a digital input at one end ;but Im pretty sure thats not it.) If you have another computer set up just borrow the monitor cable and try it. There's already an input for one end in your laptop if its ok buy an extra cable

Vga does not provide sound over the cable. For sound to go to your monitor, you need to use the hdmi cable and only the hdmi cable. Also, make sure your computer volume is turned up.

If you don't have an HDMI connection on your computer, then you will need to get a VGA cable. There should be a VGA connection on your tv. Just disconnect the monitor on your computer and connect the VGA cable from the computer monitor port to the VGA port on the tv. You may have to set the tv for PC or Aux input. You won't have high definition or sound to the tv with a VGA cable though. The sound will still come through your PC speakers.

You have a cable problem as no such thing as a VGA to HDMI cable exists.

HDMI is a didital signal and is thus not compatable with an anolog VGA signal. HDMI to DVI cables however do exist as both are digital signals.

Hope this helps.

First figure out what output video the computer has. These days it can be VGA, DVI, or HDMI. Then determine what video inputs are on the monitor (same list). Then plug in the desired cable. Many monitors only come with the VGA cable. If you do not have a VGA port on the computer you would need a DVI to VGA adapter to use that cable. Otherwise buy the DVI or HDMI cable. (DVI to HDMI cables exist if you have HDMI but no DVI on the monitor and only DVI on the computer. However, you need to check your video specs closely. A Single link DVI is different than Dual-link DVI and the cables are not interchangeable.)

Once the data and power cords are plugged in, power up the monitor and then the computer. The computer should find the new hardware and install (or ask for a disc to install) the drivers.

I hope this helps.

Cindy Wells

the Flat Screen TV if has, a HDMI input, also has VGA Input.

You must choose :HDMI or VGA, if HDMI The VGA board must Have HDMI Connector, and you connect a HDMI cable to the TV.

The HDMI is a digital signal input/output, VGA is Analog Signal. You must have Signal Converter if you Use the 2 signals