Hi all,
I recently had this problem with my machine, which I just solved, but since other people might run into it, I thought I'd put the solution up here for future users. While not strictly an Ubuntu issue (the problem appears in Win7) it is related to the Ubuntu install.
Symptom: With Windows 7 installed, installing Ubuntu with GRUB on the MBR can lead to Windows unable to enter sleep or hibernate mode (The screen will go dark for a second, but immediately come back on). Reverting the MBR using the windows 7 DVD fixes the issue (but prevents GRUB from working).
Issue: For sleep/hibernate to work, the first windows partition needs to be marked as boot, even with GRUB installed.
Solution: In Ubuntu, use gparted (If not install, add it). On your booting hard drive (usually /dev/sda), make sure that the first windows partition (normally /dev/sda1) is marked as 'boot'. Close gparted and restart.
GRUB should work just as before (It is on the MBR, so it doesn't really care), and windows will be able to put to sleep and hibernate without issues.
Hope this helps.
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