Windows Vista Ultimate Shutdown Problem

Hi, I use dual OS (XP SP2 & Vista Ultimate 32 Bit). Recently I can't shut down my vista from the start menu, when I click that icon, the vista is shutting down until the screen becomes black and state no signal but the problem is all the lights and fans from my casing are still running, the system won't shut itself down.

I noticed it once I updated my nvidia vga driver to 177.92 (still beta). Could it be the problem? Please help anyone that have the same problem with me?

Intel E6750
Gigabyte 965P-S3
Nvidia 8800GT
Corsair Twin2X 2048 PC6400C4
Silverstone Element 500Watt

No, it couldn't. But the OS needs the chipset driver in order to shut down completely. Is the Intel INF driver installed? It's on the mobo CD. After that, you need to set up the power saving options. Is BIOS set to S3/STR?

Sorry mate, apparently the problem still persist. I noticed it once after I load the game application (3D application), the vista won't shut down from the start menu. If I don't load any 3D application, it will shut down normally....whether in S3-STR or S1-POS BIOS setting mode.

Strange but true...what's seems to be the problem?

Go to the Power Options, Click change plan settings, Click Change Advance power settings.

In the "Power button and lid" section there is a "start menu power button" option that allows you to set that button as sleep, hibernate or shutdown. You may decide what the button does. It simply defaults to sleep.