Could it be caused by a cheap component not having a very long life?
well the only parts ive ever had "die" on me for no apparent reason, were RAM (thank god its the cheapest and easiest part on a computer to replace)
and a power supply, though i suspect that computer i built wasnt handling heat very well, and it was the cause.
i have heard of harddrives stuffting out on people. but they have been writing on and off the things for years, or claimed used old ones to add to their computer.
brand new HDD should last at least a decade with basic use.
i think mac users can buy and rebuy extended warranties beyond the free limited one at purchase.
however pc users have lifetime factory warranties on all parts from every company. regardless when or where you got the pc