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Here are the max memory and speeds: Lat C640 is Max 512M per stick DDR-266 (PC2100) or DDR333 ( PC2700 ) for a total of 1024 Meg
Lat D520 is either 2 or 4 Meg total. DDR2-667 ( PC2-5300 ) Although the memory can be installed one module at a time, the best performance comes from using matched pairs of modules.Maximum memory for systems with the Intel 945GM chipset is 4096MB, maximum memory with the Intel 940GML chipset is 2048MB Lat D430 has only slot with a Max of 1 Meg. You can use DDR2-667 (PC2-5300) or DDR2-533 (PC2-4200)
Lat D420 is a max of 1.5G . Use 1GB DDR2-533 (PC2-4200)
Inspiron 2200 is one slot with a max of 1280 Meg. recomended is 1GB DDR-333 (PC2700)
Here is a link to find almost any memory you need: http://www.crucial.com/index.aspx
NOTE: When mixed speeds in the same PC, the memory will run at the slowest speed installed or the highest speed allowed by your system, whichever is slower.
Have you tried adjusting the screen resolution? If you are running windows, try right-clicking on the desktop, then going to properties>settings>screen resolution. Set it to maximum available (I think it's 1024x768 on your inspiron). This should sort it out.
The display limit is determined by the LCD design. IN this case, you have an XGA LCD resolution 1024 x 768 pixels. This is a hard wired resolution and can only be changed by exchanging the XGA LCD for a higher resolution one (SXGA or higher, likeky not an available option for an Inspitorn 2200)
So your brother has laptop, and you can't change the screen resolution, I will take a guess that most likely the screen resolution right now is 800x600 or 640x480 which most games won't work with. The most likely culprit why you are not able to adjust the video resolution is that he hasn't installed the video driver of the laptop yet. You should install the video card driver for your laptop in other for you to change the resolution of your desktop. I suggest that you download the latest video driver from the computer manufacturer's website.
Also if he is using a older laptop, the LCD screen on a laptop has a set maximum resolution that you can use only. Older model laptops can only go as high as 800x600 upto 1024x768. Most of the new laptop nowadays have a minimum LCD panel of 1280x800 widescreen. Check the PC manual to see the max resolution the LCD can handle.
Make sure you have the correct driver loaded from the Fujitsu website. Additionally, try removing the Display Adapter from device manager and reboot. This will allow Windows to identify the "new" hardware and attempt to install. If asked, point Windows to the driver files from Fujitsu and that should fix you up :)