I dont know what kind of dell computer i have....?

[im not a retard] but i have had this old thing forever. Its a dell and it has a dell circle on the front. There is no visable sign of what kind of dell it is. [thanks to bying it at the flea market] im trying to buy more ram for it. I also cant open it... its kind of gray/blueish with dark linings. I really need to find out what it is. [[it has a flappy thing that opens and you plug in usb stuff.]] any help would be great.|||Go to http://crucial.com Scan your computer with their tool. It will tell you what kind of RAM you have and, suggest upgrades. It will also tell you the make and, model of your computer. I hate to be disparaging but, if you can't figure out how to open it. Installing the RAM is going to make your head explode.