My Hp pavilliin g7 series laptop running windows 7 home starts up with white screen and no beeps or sounds . Started freezing on Hp logo screen last week only sometimes. Id turn off and it would work on second try. About a year and a half ago I used laptop to preview windows 8. And after I reinstalled windows 7 it has been acting funny. Ie freezing and louder fan noise. I did recently update the bios and a pci device driver that never installed. But now it has white screen this morning. I shut off and powered up and still white. I took off battery and pressed power for 10 sec plugged back in and still white. Still no noise. Any ideas?