P-7811FX 4 to 8 MB RAM upgrade problem

Hello ladies & gents,
quick question, I have a Gateway P-7811 FX, Windows 7 64 Pro SP1, with the standard shipped 4 MB Ram.
Now I would like to upgrade the RAM from the standard 4 MB to 8 MB.

I bought 2 times 4MB Corsair Value Select ( Amazon.com: Corsair CM3X8GSDKIT1066 XMS3 8 GB PC3-8500 1066Mhz 204-pin SODIMM Laptop Memory: Electronics, same specifications as the standard ones, but the laptop simply won't detect them and will not start up with them inside.
Whichever way I tried, switching the two, just placing one, trying it with one old one and a new one, etc. still it will not detect them. The screen will stay black.

Is there a known general issue with upgrading the RAM to 8 MB (do I need to upgarde the BIOS?, or do I need to go into the bios and update something manually there?)

Any help is most appreciated.

Thanks and best from Germany!

EDIT:
Just found this thread and will try the crucial ones.
http://forum.notebookreview.com/gateway-emachines/624951-p-7811-fx-8gb-ram-upgrade.html
Nonetheless, help would still be appreciated, if I need to update something else apart from the "chocolate bar"

 

I bought 2x4 Gskill awhile back that were embarrassingly cheap and no problem. Yours should have worked it seems to me. I personally love Gskill ram.

 

Certain ram will not take the Command rate 1T which is forced by our bios. If you look at the CR it is grayed out but if you look at sisandra etc it will show up as 1T. I am not certain if it is a bug in our bios or of an intentional design.

There are certain rams that supposedly at 1066 will run at cas6 instead of our normal cas7. I have cas9 1333 memory that defaults to cas7. The sticks linked to below do cas6 per SPD but they could have issues with our systems. I should note when I had 4GB default sticks I burnt them too cas6 and saw no real improvement but this may not be as true with a QD as now I have two core's and cache's hitting the memory..........

Newegg.com - Kingston HyperX 8GB (2 x 4GB) 204-Pin DDR3 SO-DIMM DDR3 1600 HyperX Plug n Play Laptop Memory Model KHX1600C9S3P1K2/8G

 

Yep I agree here. I also picked up some G.Skill a few months back when they were, as you stated, "embarrassingly cheap" and have had no issues running the 8gb set. Really seemed to speed the system up a bit as well.

 

I don't know why you'd want to, you'll never need more than 640k.

In all seriousness, it sounds like you got a bad stick of RAM. Just RMA and try a different brand.

 

It would be nice if we could use ALL ram but our systems are picky. Since these were never officially intended to support 8GB gateway is in no hurry, or probably never will, get us a bios to fix the memory support issue(s). I haven't seen any issues with 2GB sticks then again who is going to just replace the original sticks with yet another 4GB total?