Question Suddenly 2 matched pairs wont' work!

[thewoosh]

I have an asus pz77-v lx mobo with two matched pairs of DRAM, which has worked perfectly well for years...
I had a problem and had to disassemble and reassemble my PC and now it won't start or POST with all the RAM in place.
I can start the machine with either of the two pairs in the slots 1 & 3, but if I try to put anything into slot 2 & 4, I just get a DRAM continuous warning light.
I have tried the MemOK button but this justs starts a long cycle of reboots with varying LED flash rates and ends up in the same situation - no POST and continuous DRAM LED on...
Anyone have any ideas???
Thanks

 

[PC Tailor]

Did you remove the CPU cooler?
May be worth trying to release a little pressure from the cooler as excess pressure can cause RAM slots to fault.

 

[Deleted member 14196]

something is not seated properly. cpu cooler, RAM sticks, gpu, go back through and make sure to reseat them. maybe you damaged the motherboard is my guess.

try resetting the CMOS

 

[thewoosh]

I did remove the heat sink and cpu, so I will try letting off some pressure. Who'd have thought that this could make a set of RAM slots play up!
Thanks