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Troubleshooting MacBook Pro A1278 with 1 RAM Slot Not Working Properly.

For example, if you have four RAM slots, you can fill A1 and B1 with 4GB sticks and A2 and B2 with 2GB ones. ... The asymmetric mode, or the single-channel mode, uses RAM sticks with different capacities in the slots.

Ram slots A1 and A2 not working, they worked before but then I took the PC apart and now they don't work anymore. The motherboard is MSI B250M Pro VDH B1 and B2 works just fine, I can enter windows and go on the internet and everything. I don't think there are any bent pins in the cpu slot...