Computer Did Not Shut Down Properly...but it's still on.

Is there any chance that you had a power interruption while you were away from the machine?

Not really. I was just in the other room like 10 feet away. Came back to the machine after about 30 mins or so. Screen was black like it typically is when the monitor goes to sleep. When I moved the mouse around and hit space bar to wake it up it just started rebooting. I'm thinking it's something to do with sleep or power saver, but it has been fine until today.

EDIT: Including the error reports if anyone can make heads or tails out of them.
Problem signature
Problem Event Name: BlueScreen
OS Version: 6.1.7601.2.1.0.768.3
Locale ID: 1033

Extra information about the problem
BCCode: 116
BCP1: FFFFFA8004B494E0
BCP2: FFFFF8800F179CD8
BCP3: 0000000000000000
BCP4: 0000000000000002
OS Version: 6_1_7601
Service Pack: 1_0
Product: 768_1
Bucket ID: X64_0x116_TdrBCR:2_Tdr:2_IMAGE_nvlddmkm.sys
Server information: 1a0cbe21-d9b1-4d92-b4b1-c8b902752b30
--------------------
Problem signature
Problem Event Name: BlueScreen
OS Version: 6.1.7601.2.1.0.768.3
Locale ID: 1033

Extra information about the problem
BCCode: 116
BCP1: FFFFFA800753F110
BCP2: FFFFF8800F1C0CD8
BCP3: 0000000000000000
BCP4: 0000000000000002
OS Version: 6_1_7601
Service Pack: 1_0
Product: 768_1
Bucket ID: X64_0x116_TdrBCR:2_Tdr:2_IMAGE_nvlddmkm.sys
Server information: 43da936a-57b1-426c-88c8-f35fb3501777

Okay apparently it's saying my graphics driver has failed those two listed times. I've checked the drivers and they are up to date. I'm trying to figure out how to download the current driver so I can try re-installing it.

I just wiped out the nvidia drivers and reinstalled them. Put the computer to sleep and got the same results when trying to wake it. The only thing I can think of is that I installed my Xonar DG card yesterday and it's kind of of tight fit on the mobo with the GTS450 having this huge plastic casing around it. I just see that as a hardware issue as opposed to a driver issue. Could the Xonar drivers be causing some sort of conflict that would make the video drivers fail?

Okay, after a restore point of approx 24 hours ago, wiping xonar drivers, reinstalling from disk, updating to most recent driver and then testing, I got another blue screen. I just came back from restart, rolled back the Xonar driver and I slept and woke up successfully. It's a shame because the Asus support site and forums are horrible so I guess I just stick with this driver from last year. It's odd though. In the previous box I had this card in I don't remember having any sort of issues ever and it was paired with the same gpu.

Best answer selected by jandslegate.

This topic has been closed by Nikorr.