Here they would change the motherboard. Gone are the days they repair motherboards. There are a few techs that will take a look but no tech I know will guarantee a board repair.
I don't know your skill level but did you get out a microscope and check for bent pins?
There's also a SLIM chance it's the CPU not seated right or a bent pin in the CPU socket.
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.