Touchpad pointer jumps around when connecting to samsung 40'' LCD

Hi guys
For the past two years, I have been connecting my macbookpro 13’’ (mid2009) to my Samsung 40’’ LCD using mini displayport to hdmi cable, suddenly something went wrong and the touchpad pointer started to jump (twitch) around. I tried different adapter but the problem still occurred. when I remove the cable. the pointer act normal.
Last night I connected my MBP to an old made in china LCD TV and everything worked fine.
what do you think is the problem? Is there any troubleshooting steps I should do? Please help

No trackpad control when HDMI cable connected or trackpad goes crazy when HDMI cable connected?
The erratic Track Pad/Magic Pad behaviour could be caused by the SMC.
Try resetting the SMC this way:
1. Attach the HDMI cable.
2. Power off the MacBook Pro.
3. Press the L-Shift/Control/Option and Power button at the same time and hold.
4. Release them all at the same time (its ok if the MacBook Pro power on now)
5. Then power on the MacBook Pro.
Not only did my USB regain functionality, but it appears to have resolved my erratic Track Pad/Magic Pad behaviour. It now operates as it had done when new.
http://www.algarvepropertyworld.com

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Greetings,
I have been using the HDMI port of my Macbook pro retina for 1 year with my samsung LCD,
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There are several possible causes for this issue. Please take each of the following steps that you haven't already tried until it's resolved. Some may not apply in your case.
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9. There's also a report of erratic cursor movements caused by an external display that was connected but not turned on.
10. If none of the above applies, or if you have another reason to think that your computer is being remotely controlled, remove it from the network by turning off Wi-Fi (or your Wi-Fi access point), disconnecting from a Bluetooth network link, and unplugging the Ethernet cable or USB modem, whichever is applicable. If the cursor movements stop at once, you should suspect an intrusion.
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