Dear Sir : I have a laptop Asus F5R that I have installed the Windows 8 and the problem that I have that the laptop show the log on but doesn't give the lo gin at all. The thing is that after the the log on the screen become black and that's why the technician call black screen. So I have use a USB recovery disk but the laptop doesn't let me get inside the usb recovery disk only show again the lo gon and after that appear the black screen again, also I have tested the Windows DVD and the same thing. So I am wondering what can I do to get into the repair options to fix the operating system. Also I have disconnect the hard drive and I put it in a usb dock to read the hard drive and see the status of the hard drive and the hard drive is in a good conditions, I have defragmented and scanned it for errors as well. One more thing I have checked the Bios to see if the mother board recognize the units and everything is fine with the units or hard drive. So would you please help me out to resolve this problem?