My girlfriend has an E-machine. It's running XP Home 2002, SP2 with onboard sound and graphics. It has an eMachines Imperial Motherboard and has only 256MB of PC2100 system RAM (all according to crucial system scanner). The crucial scan states that the PC can take upto 2 x 1GB sticks of upto PC2700 RAM and that different speeds can be mixed.
Using this info, I ordered a single 1GB stick of PC2700 RAM from ebuyer but when I installed it alongside the 256, I got a longish single beep, followed by three short beeps, then 3 short beeps again, then a single beep. The machine would not POST and nothing was seen on the display. I removed both old and new RAM and just tried the new RAM on it's own..... same result even trying both RAM slots one at a time with the new stick. Putting the old 256MB PC2100 stick back in returns the machine to it's normal (S L O W) working state.