hi, im running an ibook g4 800 mhz with 384 mb ram upgraded from 256. i upgraded about a week 2 weeks ago due to the fact that i run itunes and imovie together alot with alot of saved files between them. I fitted the ram without any problems, and it has been fully recognised by the computer and os, however most of my applications close one by one after about 20 - 30 mins of use. im not suddenly doing loads of extra stuff at the time or since the ram upgrade. im just wondering if i need to change anything in the settings and have overlooked it? if any one can help i'd be very grateful as it's starting to get quite annoying.