Non functioning DIMM slot (one of the t) on ASUS motherboard

Hello friends.
Now this really whacks me...
I had a 2 GB ram on my ASUS M4A78LT-M le for the last six years, since 2k11. As I had only one stick, I never thought about the other DIMM slot, until today, when I got the opportunity to add another RAM stick with 4 gigs of memory.
To my dismay, however, both of 'em didn't work together.
After much "investigation" it occurred to me that the unused slot is not working: no sticks could be detected on it. But both the sticks were detected when inserted in the slot I'd been using till date.
Taking into consideration my Motherboard's Model No., can any of you suggest if this issue can be fixed somehow, like by going to the service center?
Well, I stay in Kolkata, West Bengal, India.
PS - both the ram sticks have same operating frequency of 1333 MHz, so there isn't any question of mismatch.

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You'll have to take it in to find out.
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If both sticks work in one slot but neither stick works in the other slot then you have a bad slot.

Get a can of compressed air and give the bad slot a blow out.
Get a good light and a magnify glass and inspect the bad slot for damage.
If you still can't get it to work then you have 2 options.
Replace the mobo.
Put the 4GB stick in the working slot and accept that you have doubled your ram.

If you have a 32 bit OS then getting 6GB to work would be a waste of time.

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