Screen goes on and off until I apply pressure to left speaker?

When I turn my MacBook Pro on the screen will go on and off until I apply pressure to the left speaker. The system is running fine and continues to work without issues. I looked inside and there are a couple of screws missing from the case so I ordered them.

Any ideas would be greatly appreciated? Many Thanks

Answered! View the answer I have this problem too

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hi mayer that did not fix the issue it still needs me to press on the speaker next to the tab key,to begin with ,but once it has booted up completely it seems ok ?

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is it possible that the little pins on the mother board are not contacting the outer shell, i noticed one or two of them do not spring out like the others ?

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You are pressing on the LDVS cable connection to the logic board. Open the machine up and reseat the connection. Use some kaptan tape to help hold it in place.

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is it possible that the little pins on the mother board are not contacting the outer shell, i noticed one or two of them do not spring out like the others ?

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Is it possible the screws which were missing are still loose inside shorting something. Can you tell us what screws you had to replace.

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I have the same problem on a MBP 5,1 (late 2008). The sweat spot I have to press is right on the left of the caps lock key. I was suspecting LVDS cable too but the cable is very close to the monitor and don't go near the caps lock key.

I try to disconnect and reconnect LVDS cable but got no luck so far. I might try to remove the logic board to see on the other side.

Let me know if you find a solution for this. Thanks!

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