how come my television wont read my laptop when i connect it?

al3k5

New member
I have a sony vaio laptop, and would like to watch a movie online but watch it on my television. I plugged my HDMI into my laptop and tv like i did with my old HP which always worked. On my HP i would just right click and click on graphics options or screen options or something. But on my compaq there is no such thing, and my tv screen reads that Its plugged into my computer but it says no signal..?
Now it says invalid format...
 
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