How can I use my Sony 40″ TV as a monitor for my desktop? I am having problems.?

Question by pink.floyd612: How can I use my Sony 40″ TV as a monitor for my desktop? I am having problems.?
I hook my TV up to my Lenovo desktop and I switch the TV to the PC input. When I turn the computer on it comes up on the TV and shows it booting up. I gets to where it is showing Windows loading up and it flips back to the TV screen and says that there is “No Signal” detected. Can someone help me with this please. Thanks.
I am just using a regular monitor cable.

Best answer:

Answer by mr_crankypants
How are you connecting to the TV, are you using a DVI-HDMI Cable or some other method? Also what type of video card is on your lenovo?

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