Problem with Acer is that they now insist on doing their own servicing rather than allowing the supplier to do it - I have an Acer at the school I work at that is currently on it's fifth trip to their place at Plymouth since the end of January.
Just before Christmas it failed to boot, so I rang Acer & they told me to do a restore from the disks, which I did. After the Christmas holiday, it happened again, but this time I couldn't even get into it to boot from CD, so it went back - Trip 1
Four days after its return, same thing happened - Trip 2
Came back pretty quickly - but with XP Home on instead of Professional, which is no good because we can't put it on the domain - Trip 3
Came back again, right OS, but froze with warning - 'some system files are missing' -
This time they wanted to charge us £38 because the problem was 'software related' until I pointed out that as they'd just completely reinstalled everything from scratch, it must have been them that caused the software problem - Trip 4
Came back again - with XP Home on again - Trip 5
To be fair to Acer, they do make it very easy to send back, they just give you a number and you ring DHL, but it doesn't really need DHL anymore, it should be able to find its own way there by now...