I had this happen with my XP box. It was just a setting in the bios that I had to change. It was set to not allow sleep or hibernate. Once changed, all was well.

You can usually enter the bio/EFI setup when you first fire it up by pressing F12 or escape or something like that. I forget, but it usually says on screen.

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1991 560 SEL / 185k miles
1992 750il / 17k miles - project car