Mini display to vga not working on 2010 Macbook Pro

I'm trying to hook up my MBP to an external display but it kept showing "No Signal" on the external display. I have verified that the mini display to VGA adapter is working as I've tried it on a separate MBA and 13" unibody MB.
I brought it down to the service centre and they've replaced the motherboard for me but it's still the same. I have also tried the SMC reset but to no avail.
Help!

This is the Mac Pro desktop forum. I requested your post be moved to the MacBook Pro laptop forum.

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