I recently got a new motherboard for my Intel Core 2 Quad 9300-based PC (the old motherboard was fried). The old motherboard was an ASUS IP35 Pro, while the new one is a Gigabyte G41MT-S2.
Since the change in motherboard/chipset, I've noticed that when the PC is idle for a long time, the power LED is turned off and the computer doesn't respond to keyboard/mouse events. However, pressing the power button results in a near-instant restoration of state.
The computer is clearly not in S1 suspend state, since the PSU appears to be off. Is this normal behaviour for any of the ACPI states? Is this what is supposed to happen in S3?