I just recently moved from a D610 to a D630 and decided to go Vista 64-bit. When put the computer into Sleep mode (Hybrid Sleep is turned off by the way) here is what happens: 1. Screen goes blank immediately 2. Hard drive activity for a minute or so 3. Sometimes it goes into sleep mode but usually it just turns off In the case when it just turns off, which is most of the time, then I when I turn it back on it prompts to boot into Safe mode if I want to, indicating windows didn't shut down properly. Any ideas on how to troubleshoot this and figure out what might be causing it and how to fix it?