I'm running a Deskstar desktop machine with Ubuntu 10.4 LTS (also occasionally dual booting with Windows XP). The machine is almost 10 years old and has operated without problems until about a month ago, since when it has sometimes froze (requiring a reboot) or it suddenly logs me out or the desktop style suddenly changes. If this occurs it's always within 5 to 10 minutes of me switching the machine on (it's normally switched off); if it gets past 10 minutes there are no problems. I've run a memory test from the Grub boot menu with no problems, and run an fsck on the partitions being used without problems. This problem also occurred on one of the odd occasions that I boot into Windows XP. I'm therefore suspecting a hardware problem of some sort. Any suggestions of which component, would it be worthwhile attempting a fix, or bearing in mind the age of the machine should I get another one (it's still perfectly adequate for my requirements)?