Why will my macbook pro no longer connect to my tv?

Hi all,
Until a recently I had no difficulty connecting my mid 2010 macbook pro to my LG tv using a mini display port to HDMI cable. The software on the Mac is OS X Lion 10.7.3 Now when i plug it does not work. The tv recognisies the computer is plugged in but it enlarges the screen so can only see a small part and the display on the computer does the same so I can get into the display menu to do anything there. When I unplug it it goes back to normal but i cant do anything with the display preferneces as its not plugged in. I have tried a new cable but this didnt work. Any suggestions?
Thanks

Sorry, that should read that i can't get into the display preferences.

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Thanks for using Apple Support Communities.
Please follow the steps below to troubleshoot having no display on the external display.
No video or no signal, image distortion, "snow," or flickering
Check connections
When using an external display be sure to check the following:
If you're using an Apple notebook, confirm the AC power cable or adapter is securely connected to the computer and the cable providing power to the display is also secure. It is always good to have your notebook connected to AC power when an external display is in use.
Confirm display adapters are fully seated in their respective connections and that they are supported models and for the computer and display. Refer to these articles to assist you with adapter compatibility and further configuration information:
Monitor and Display Adapter Table
About Mini DisplayPort to HDMI adapters
Apple Mini DisplayPort adapters: Frequently asked questions (FAQ)
Thunderbolt ports and displays: Frequently asked questions (FAQ)
Remove all display cable extenders, KVM switches, or other like devices and retest to determine if the issue is resolved.
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Reset the system
You can reset the Mac's parameter RAM and SMC.
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Start by resetting the Mac's parameter RAM. If the display does not come up, was previously set to an unsupported resolution, and still results in no video:
Start up in Safe Mode.
From the Apple () menu, choose System Preferences.
Choose Displays from the View menu to open the preferences pane.
Select any resolution and refresh rate that your display supports.
Restart your computer.
Apple computers: Troubleshooting issues with video on internal or external displays
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