I have an ASUS M4A78LT-M-LE motherboard, and I bought a new stick of RAM for it (Kingston KVR1333D3N9 - 4GB, 10600 CL9).
However, when I put this new stick in, the computer does not boot - it powers on but the screen stays black, hard-drives do not spin up, etc. This occurs when I put the new stick in alongside the old one, or by itself in either of the two DIMMs.
Thinking that the stick was faulty, I took it back for a replacement, but the replacement suffers from exactly the same problem!
What could be causing this? Is the RAM not compatible? Should I be buying a different brand, or is my motherboard faulty?
The RAM timings in the BIOS are all AUTO.
edit: The old RAM stick is 2GB G-Skill DDR3 CL9. I'm pretty sure that the new stick is DDR3 (which the motherboard does support). edit 2: The old RAM stick is DDR3 ! Sorry for this misleading information!
edit 3: Thanks everyone for your enthusiasm in trying to get to the bottom of this. I'm about to flash the BIOS to see if that will help. I'm sorry for posting confusing information about the old RAM. I am 100% certain that the motherboard is ASUS M4A78LT-M-LE (sudo lshw), and both sticks are DDR3. Sorry again for the confusion.