memok LED shows that your PC can't access the RAM.
Since you have 2 RAM sticks and 4 RAM slots, you have to go through the tedious work of testing which RAM or which RAM slot doesn't work anymore.
Idea is to test each RAM stick in each RAM slot to see if PC works or not.
The test procedure is more-or-less as follows:
Take out both RAM sticks and mark on your head or in paper stick #1 and stick #2.
Take stick #1 and put it into 1st RAM slot. Leaving all other slots empty. Boot up. Mark if stick #1 works in 1st slot or not. Repeat the process with all RAM slots, e.g:
Stick #1 in 2nd RAM slot. Boot up. Mark the results on paper.
Stick #1 in 3rd RAM slot. Boot up. Mark the results on paper.
Stick #1 in 4th RAM slot. Boot up. Mark the results on paper.
If you've tested stick #1 in all slots, take stick #2 and repeat the process.
Stick #2 in 1st RAM slot. Boot up. Mark the results on paper.
Stick #2 in 2nd RAM slot. Boot up. Mark the results on paper.
Stick #2 in 3rd RAM slot. Boot up. Mark the results on paper.
Stick #2 in 4th RAM slot. Boot up. Mark the results on paper.
After all that is done, test if your PC works when both RAM sticks are inserted. Look at your findings and insert RAM sticks to those slots where they worked. E.g when stick #1 worked in slots 1, 2 and 4 put it into any of those slots. Same with stick #2. If stick #2 worked in slots 1, 3 and 4, put it into working slot.
You might want to get out your MoBo manual and look the RAM channel layout as well. Usually it's either:
Slot 1 - Channel A
Slot 2 - Channel A
Slot 3 - Channel B
Slot 4 - Channel B
or
Slot 1 - Channel A
Slot 2 - Channel B
Slot 3 - Channel A
Slot 4 - Channel B
For best performance it's good to have 1 RAM stick in Channel A slot and 1 RAM stick in Channel B slot to get your RAM running in dual-channel.
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