Maximum PC

After getting the same BSOD for the third time, it seems (somewhat hesitant to double check) that I will get the electronic PC tidal wave whenever I accidentally press the power button to wake my PC from sleep mode instead of the space bar (the power button is configured for instant off.) The BIOS is bone stock aside from enabling XMP and disabling internal graphics. *EDIT* Upon startup, at least this latest time, Windows "installed drivers" for several USB devices and a hub, which I hadn't touched since the initial build. I've never seen this happen before.

Specs:

Core i5 2570k
Gigabyte Z77 UD5h
Corsair 8GB 1600 Mhz RAM
Nvidia GTX 480 graphics card

This is what event viewer had to say, chronologically:

The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly.

ACPI thermal zone ACPI\ThermalZone\TZ01 has been enumerated.
_PSV = 379K
_TC1 = 1
_TC2 = 5
_TSP = 1000ms
_AC0 = 0K
_AC1 = 0K
_AC2 = 0K
_AC3 = 0K
_AC4 = 0K
_AC5 = 0K
_AC6 = 0K
_AC7 = 0K
_AC8 = 0K
_AC9 = 0K
_CRT = 379K
_HOT = 0K
_PSL - see event data.

Drivers load up

The computer has rebooted from a bugcheck. The bugcheck was: 0x00000050 (0xffffffffffffffd0, 0x0000000000000001, 0xfffff800032a432c, 0x0000000000000000). A dump was saved in: C:\Windows\MEMORY.DMP. Report Id: 080312-9562-01.

This isn't crucial, but it is annoying if I forget my machine is in sleep mode. Please help me out.

Maybe instead of instant off, you configure the power switch for a 4-second hold down delay?

It could also be bad memory. I had an issue with another build where it wouldn't wake up from sleep mode and after replacing motherboard and PSU, I RMA'd the RAM, and it turned out that was it.

I have the same motherboard as you with an Antec Nine Hundred case. Whenever my comp goes into sleep I have to press the power button to wake it up. My system will not wake by pressing the keyboard. To be honest I don't know how I set that up but it works for me.