Hello all, I am new here, and new to tinkering with the insides of computers. I need some advice on how to improve on the machine I have. (emachines T3958, Intel celeron D 340, 512mb ram originally). So far I've replaced the 512 with 1g of ram and also installed a 256mb graphics card. I would like to increase the ram past the 2g limit that the machine's specs tell me I can install. What components will I need to replace to accomplish this? (processor, motherboard etc.) And what would be compatible with my machine? Thank you very much for the help.