PC Doesn't boot after installing new ram

Hello.
Recently I ordered a simple module of 1GB DDR2 ram.
Before this I had 1.5GB installed, both modules from different brands.
I removed the 512mb module and placed the new 1GB module.
The PC would not boot, it wouldn't even show me the splashscreen. The monitor didn't get a signal.
I tried putting it in the first and second slot, with and without another brand. No luck.

So i've sent it back and got a replacement. I installed the replacement and it worked for about 3 minutes.
It would even properly show up in CPU-Z. Then after 3 minutes I got a blue screen of death, and right after that it went to "No signal" on my monitor again, and again it doesn't want to boot.

What can I do?

It might not be perfectly compatible, so I recommend trying some different memory. You might first want to look up to see what's guaranteed to be compatible with the ASUS P5L-MX:

http://dlcdnet.asus.com/pub/ASUS/mb/...P5L-MX_QVL.pdf

Hmm it isn't on that list.
Does that mean I just have to get one that is compatible with my motherboard?

Changed the voltage from AUTO (1.8v) to 1.9v, works like a charm now.

CrackedHippo said:

Changed the voltage from AUTO (1.8v) to 1.9v, works like a charm now.

If you still have issues later on because of this memory, then the answer to your question above is Yes.