M9 wont see more memory installed

SOURCE: Memory/Graphic problem

This might have something to do with DVMT or Digital Video Memory Technology. Basically, the amount of video memory is dependent on the amount of memory installed. I'm not very familiar with acer system BIOS but try to look for VIDEO under system BIOS and try to select any fixed video memory if possible. you can also try to disable DVMT.

SOURCE: memory slots?

I found the solution to roger2 and my own problem. The secondary memory add-on slot is on the bottom of the unit, and can be accessed by removing one screw and the slot cover. The other, main memory slot is actually located underneath the keyboard. You should shut down the computer completely, unplug the power plug, and also remove the laptop battery before installing memory. Also, it may void your warranty if you mess around inside of your laptop, so please keep this in mind. You will need to take a very thin flat head screwdriver to gently pry up the panel above the F1-F12 keys. The panel is the entire plastic piece covering the speakers that has the power on, play, stop, ff, rw buttons on it. I used a very thin and flat hair clip that I found laying around to pry up the edges starting from the Pause/Break key moving left towards the ESC key. The screen lid has to be opened all the way for the piece to be completely removed. Once that is taken off, you will see two small screws holding the keyboard in place. Remove these two screws and gently pull out the thin ribbon cable connecting the keyboard to the laptop. The ribbon cable is located directly underneath the spacebar, so move slowly and carefully when removing the keyboard so as not to damage anything. In the center of the exposed area, there is a sort of rectangular metal cover with two screws holding it in place. The one that is about the same size as the slot cover on the other memory slot is the correct one. Remove the screws and open the metal cover. Underneath is the other memory slot. After you install the other memory stick, if you have 4 GB of total RAM, you should know that in 32-bit operating systems, Windows will only be able to use approximately 3.0-3.5GB of RAM. This is because of a limitation of 32 Bit Windows operating systems, and not because of the RAM itself. Only 64-bit operating systems will be able to use all 4 GB. On my system for example, I have the same Toshiba M105-S3041 laptop as you do, running Windows XP Home with two 2 GB sticks, and My Computer properties shows that I have 2.99 GB memory.

SOURCE: compaq x1000

The second memory slot is under the keyboard.
Remove two screws at the bottom.
Move downwards 4 switches at the top of the keyboard betwwen these letters (es-f1, f4-f5, f8-f9, f12-del) and raise it from the top.
Be careful not to remove keyboard ribbon-band.
There it is!!!!
Replace memory as standard.
Reverse procedure to set laptop to normal.

SOURCE: To upgrade my Asus Eeepc 4G

I've got the same little EEE as yours. I just did a bit upgrade my little one with a ram DDRII 2GB. That's the most it can go. I asked about the internal HDD, they said that EEE-PC has a built-in one. So, it ended up that I put an internal HDD into a box. That will solve it all. And...OH! I changed WINXP to Linux as well. That saved some space...I believe.

SOURCE: Adding memory, new total not recognized: IBM Thinkpad R51e-1844

Ram should always be paired. Same type, speed and size in each slot. You may have 1 SIMM/DIMM/DDR that has 2 sides of chips and the other with 1 which will do exactly what you state. RAM reads across the chips simultaneously. So if you have a different one in each slot it can go bonkers and do goofy stuff on you.