I have an acer aspire desktop with 4GB of memory. It ran for 2 minutes after return from repair. I took the memory out of it and replaced one stick... it runs fine... I swapped the sticks... it still runs fine... I put the second stick in and it doesn't boot... not even the bios screen comes up..
Memory: 2 sticks of: 2GB GDDR3-1333 128MX8
Sticks have different bar codes on them...