Great - glad you got it working.
It does sound like your BIOS setting did somehow change from S1 to S3, causing the problem.
I'm not sure what might have caused it to change... power spike, CMOS battery getting old, Win update, ...
Normally if the CMOS battery is dying, the Date/Time setting gets lost.
If this does happen again, I'd replace the CMOS battery.
I have seen systems where S1 sleeps and wakes up ok, and S3 does not...
Seems you have that situation.
If you're happy with S1, leave well enough alone
If you want to pursue the S3 issue, the Gather Trace Info tutorial might help...
Don't worry about S2, i don't know if it's used (anymore), can't remember the last time (if ever) i saw it.
POS = Power on Suspend
STR = Suspend to RAM
This description is from my MB manual.
ACPI Suspend Type
Specifies the ACPI sleep state when the system enters suspend.
S1(POS) Enables the system to enter the ACPI S1 (Power on Suspend) sleep state.
In S1 sleep state, the system appears suspended and stays in a low power mode.
The system can be resumed at any time.
S3(STR) Enables the system to enter the ACPI S3 (Suspend to RAM) sleep state (default).
In S3 sleep state, the system appears to be off and consumes less power than in
the S1 state. When signaled by a wake-up device or event, the system resumes to
its working state exactly where it was left off.
Please mark this thread as solved.
Enjoy a restful Sleep