Win 7 Pro x64 Hangs on Reboot, But Not On Shutdown

Hello, I've got a really strange problem here.

Windows 7 Professional x64 edition is installed on a computer. During the installation, every time it went to restart the system would hang immediately; I had to do a hard reboot to continue the installation.

Now Windows 7 is installed, and still hangs on reboot. When I choose Restart, the system shows the shutdown screen, goes black, and hangs. After some time waiting it never reboots and I never see the BIOS screen. However, if I choose "shutdown", it works perfectly.

Also, when I force it to reboot, the system does NOT give me the message that it wasn't shut down correctly. I've reinstalled the system twice. All drivers are installed correctly, and Windows is completely up to date. I even updated the BIOS to the current version.

It's also worth noting that I also booted this machine using a Fedora Linux Live CD, and it restarted without a problem.

Any ideas would be very helpful. Thank you!

As requested, here is more information on the parts in the computer:

Motherboard: ASUS P7P55D-E LGA 1156 Intel P55 SATA 6Gb/s USB 3.0 ATX Intel


CPU: Intel Core i7-870 Lynnfield 2.93GHz LGA 1156 95W Quad-Core Processor BX80605I7870


Power Supply: Antec EarthWatts EA650 650W Continuous Power ATX12V Ver.2.2 / EPS12V version 2.91 SLI Certified CrossFire Ready


Ram: Kingston 4GB 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10660) Desktop Memory Model KVR1333D3/4GR



HDD: Seagate Barracuda 7200.12 ST31000528AS 1TB 7200 RPM SATA 3.0Gb/s 3.5" Internal Hard Drive


Video Card: BIOSTAR VA5573NHG1 Radeon HD 5570 1GB 128-bit DDR3 PCI Express 2.0 x16 HDCP Ready


The Windows 7 x64 build was a clean install (in fact, my friend installed it clean from scratch TWICE when the first one had issues).


Thank you!