Enable 2nd Ram Slot

Posted onby
Hi Guys,
I've got an Asus P5B Deluxe motherboard. Today I tried adding some new RAM to take it from 4GB to 8GB. The board is about 6 years' old. I've never used the black RAM slots before, only the yellow ones (2x2GB in slots 1 and 3).
My system only sees 6GB, not 8GB. I've tried various combinations of the RAM, get the same result.
To check the new RAM wasn't defective, I tried it in slot 1, a known good slot. All 4 sticks of RAM worked in slot 1, so the RAM wasn't faulty.
All 4 sticks work in every slot except slot 2 (the first black RAM slot). If I put any stick in slot 2 - old or new - the PC is dead, it won't even boot to the BIOS.
So it looks like I have a defective RAM slot.
Does anyone know of any way to fix this? The board is too old to RMA. I've tried an emery board down the defective slot, and I've tried squirting WD40 down it. No improvement.
Does anyone have any other ideas on how to get that bad slot working?
Thanks!

How To Enable All Ram

Slot

External Ram Slot

OOBE, 4 GB RAM installed on the PC by default. I am looking to upgrade the RAM to 16GB. Before doing that, I wanted to check both the RAM slots, (motherboard has only 2 RAM slots.) I placed the 4GB RAM on the secondary slot and the PC did not boot or detect RAM. Lets say you have four slots of memory available, and the first two are occupied by two 1GB RAM modules. You could now make the decision to buy two additional modules to put them in the two unoccupied slots of the motherboard, buy a 2x2 Gigabyte set instead and replace the existing modules or go overboard and buy 4x2 GB modules instead. Second RAM slot is not working! I try put there 2 different DDR3 (original Samsung and Kingston). Both of them working fine in the first slot. But not working in the second one. Not working separate in second one, and not working together with the first slot. First slot separate working fin.