I have an HP HDX 18T laptop. It originally came with Vista Ultimate 64-bit. A few months ago, I performed a clean install of Windows 7 Ultimate 64-bit. I installed all of the latest drivers directly from the HP website. Everything was working fine for several weeks. I'm not sure what triggered this issue, but somewhere during the process of reinstalling all my programs, I noticed that the laptop started crashing every time I gave the standby or hibernate command. The screen goes black, but the hard drive still spins. After about 5-10 minutes, the computer finally shows the BSOD with the message "Windows Power State Failure". It does this every time I try it. I have all of the latest Windows updates. I've also checked the BIOS and I have the latest version. Is this a driver issue, or could one of my software installations have triggered this? How can I find out?