On my Lenovo T400, Windows 7 can sleep but cannot hibernate.
When choosing hibernation, the screen turns black, but then there is one beep, and the screen turns back to what it was before choosing hibernation.
The problem seems changed and I didn't do anything.
When I choose sleep, the screen goes black, and all LEDs on the bottom of the lid do not change compared to before choosing sleep. i.e. the moon LED is never on and the wireless connection LED is never off. Does it mean the laptop cannot sleep?
When I choose hibernation, the screen turns black, and finally only two LEDs are on and they are battery and plug-in.
So now it looks like it can hibernate but not sleep?
Operating System MS Windows 7 Home Premium 32-bit CPU Intel Mobile Core 2 Duo P8800 @ 2.66GHz Penryn 45nm Technology RAM 1.9GB Single-Channel DDR3 @ 532MHz (7-7-7-20) Motherboard LENOVO 2764CTO (None) Graphics ThinkPad Display 1440x900 @ 1440x900 ATI Mobility Radeon HD 3400 Series (Lenovo) Hard Drives 244GB Western Digital WDC WD2500BEVS-08VAT2 (SATA) Optical Drives HL-DT-ST DVDRAM GSA-U20N AZCDW EFCPUZ452 SCSI CdRom Device AZCDW EFCPUZ452 SCSI CdRom Device Audio Conexant 20561 SmartAudio HD