I have a Philips Freevents 11NB5800 Laptop on which I have Windows 7 Ultimate. It all works fine except for one little thing. I've set a Power Option for it to go to Sleep if I shut the lid. If I leave it for, say, half an hour and open the lid again, I can switch it on and log on where I left off.
But if I leave it on Sleep for over an hour (or sometimes 2 hours) then when I come to use it again, the screen is blank and I can't get it to wake up again. I have to hold the Power button down for a few seconds for it to switch off, and then I have to switch it back on again as normal. I then get the message saying that Windows did not shut down properly.
It's a fresh activated installation of Windows with updated drivers. There are no other programs on it (except for Kaspersky). It did the same thing under Vista; I often can't get it out of Sleep. The BIOS settings are all on Optimised Defaults.