Some small things, from connections not working to other software things, I say software because it probably was windows causing the problem, but since we couldn't solve the problem by installing Windows over and over again we gave up, it was something hardware in the end, may overheated??
Now don't get me wrong, my friend got a new laptop after that one and again that was an Acer, they are good laptops and Im pretty sure nothings wrong with them, he hasn't had any problems so far
Toshiba is more expensive, but I have a good history with them. Acer really is value for money