The previous attempts used A pair of "Crucial Technologies" PC3200 400 MHz, 1 Ghz sticks, and two different pair of Komputer Bay 1GHz, PC2700, 333MHz sticks. No combination of those would boot either - altho i never tried just one 1Ghz stick that time either. Recently, somebody selling memory at a PC store told me that i had to match the speet exactly - faster wasn't good enough - so i bought a couple pair of 266 MHz DDr sticks. They don't seem to work either. Hmmmmmm...