Dual monitor suddenly stops working - flickering & vibrating

Using a mid 2010 15" macbook pro with a LG Flatron W2261VP monitor and dual displaying these two worked perfectly for the past year with a HDMI cable into the thunderport. However suddenly it stopped displaying correctly, the MBP would detect the display correctly but the monitor would remain blacked out. The only resolution that functions is 1080i but it vibrates and flickers intermediately so unable to use without getting a major headache.
Anyone have any suggestions on how to fix this issue without buying new hardware?
Thanks in advance,
Alex

Hey Alex,
Thanks for the question, and welcome to Apple Support Communities.
When troubleshooting issues with external displays, the following article usually provides best practices:
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/ht1573
If the above does not resolve your issue, I recommend that we reset the SMC and PRAM for your MacBook Pro:
Intel-based Macs: Resetting the System Management Controller (SMC)
http://support.apple.com/kb/HT3964
OS X Mountain Lion: Reset your computer’s PRAM
http://support.apple.com/kb/PH11243
Note: Resetting PRAM may change some system settings and preferences. Use System Preferences to restore your settings.
Thanks,
Matt M.

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