New 2GB memory module doesn't work in slot/bank 1
Bought a 4GB kit from Crucial (CT25664AC800) to replace my current 2x1GB modules. After installing it, my computer doesn't boot up and starts to beep right after I turn it on. It makes three consecutive quick beeps.
After some trial, I isolated the problem to be in memory slot/bank 1. The only memory that works in that slot are the original 1GB modules. All combinations of configurations work except configurations that include a new 2GB module in slot 1.
I'm sure that I'm properly inserting the module in the slot. Original modules work on first try and I already cleaned the slot with a contact cleaner and a tooth brush.
Please advise, I don't know what to do right now, Crucial says that if both modules work in slot 0, then the problem is in the slot or that I'm not seating it properly.
Is this a good question?