So for 1 year period, that PC is covered under warranty, and any
problems diagnose that results not from the user, is rectified
FOC.
So if it doesn't function well because they didn't put it
together properly, and found not to be because you messed with it,
while under the warranty, why would they charge you? Anyway most PC
components like HDD, and motherboards are covered under their
individual warranty, so the shop can also tell you, don't bother
them go find the individual supplier.