You DIY also got warranty de mah, every single item inside
ranging from processor to PSU ram and HDD even ur GFX card all got
manufacturer warranty.
But problem is, u need to go different places when different item
spoil
Then hor, what if your computer won't start up?
You need to spend time or even money for someone to come and check
to see what is wrong, isolate the problem to a component then find
where to send it for service.
You buy branded one just make phone call ask them come down collect
and be done with it.
And also hor, my cousin bought a computer from courts 3 years ago,
bought extended warranty for +$200 the blardy gfx card keep spoil,
one year spoil 2 - 3 times, dunno is he watch too much av or what,
then recently courts ran out of Nvidia GF4s so they upgraded his
mother board gave him a 6600 -.-""
THen his monitor from 19 inch 4:3 dunno what china brand now is
acer 20" wide. His warranty ends next month.