How to make a KVR1333D3S9 work with a MacBook Pro 7.1? I recently bought a couple of memory modules from Kingston to be used on my MacBookPro 13" 7.1, they are KVR1333D3S9/4G which should work fine with the computer as the frequency and latency is supported, but when I installed them OSX will never boot, it stops on DSMOS as arrived.

The only way I fount to make it work is using one of the KVR and one os those that the computer originally had. But then the memory works at 1067 and worse,I don't have 8GB but only 6.

Googling I found that I should had to buy a certified memory, and I know, I should googled a bit more before buying this memory, but I don't want to give up, not now.

Does any of you have a "trick" for this kind of memory to work.
There really isn't any trick for running RAM that your Mac doesn't like. It appears that Mac OS X is more forgiving of RAM problems in Safe Mode (which makes sense, when you think about it).

But it sounds as though one or both of the Kingston memory modules is bad. I suggest that you install one of the modules, then boot normally and run Memtest, then swap that module for the other one, and run Memtest again.

You can get Memtest for free at this link:

http://forums.macrumors.com/showthread.php?t=788590

If one module is bad, then exchange it. If both modules test OK, then you are still best off returning them to where you bought them for an exchange.