Acer 5733 frequent hard drive problems

Hi

I've got a Acer 5733 laptop and it's had nothing but problems.

Whilst under warranty, i returned it to acer for a faulty hard drive. They replaced it.

Once the warranty had expired, it happened again so i replaced the hard drive myself and reinstalled windows. It then happened again, so i assumed that it had been a faulty hard drive that i'd used, so i bought another and installed windows. This one has now also failed.

I'm pretty sure it's not worth fixing again but just wondering if anyone could shed any light on what's causing these issues all the time and whether there's a fix for it? It's been driving me mad! :(

Or should i just sell it for parts and call it quits?

Thanks for your help :)