My friend recently bought an Acer 4530 laptop which is quite decent. But it seemed like it had some issues with Standby and Hibernate since it would just hang when we clicked on them. The only way out was to hard reboot the system. I was using WinXP+sp2.
I got an idea that the problem might be because of the drivers. So installed sp3 on the same thing and tried it out. Works like a charm now.