Hi, this is my first post and I didn´t see the need to open a new topic....
I have the same problem with the logon screen in Windows 7 Pro...
First my specs.
Q9550 (No OC)
Asus P5Q (It worked on two other sites)
2HDD (Samsung F3 1TB y WD Green 1TB) both of them ERROR free
2x2GB GSkill PI DDR2-900 @800MHZ (error free more than 10 loops on memtest)
ANTEC NeoPower 650W
Pioneer DVD/RW Drive
XFi Fatality PCI
2 Case fans (80mm)
Xigmatek Dark Knight CPU Cooler (connects to MB)
And now a list of what I have tried:
1.- Uninstall video driver and reinstall (problem) and uninstall Sound driver (using computer with and with out sound driver, same problem)
2.- Change Video driver (have used 258.96 WHQL, 260.99 WHQL, 262.99 WHQL, 263.09 WHQL, and 266.35 BETA) downloaded several times each one from different sites, to avoid corrupted drivers
3.- Update Motherboard BIOS (using last one available from ASUS site)
4.- Eror checked the HDD with several tools and made a Low Level Format, Used either AHCI or IDE
5.- Several formats on system drive and have used 3 differents Win 7 discs (Win 7 Pro 32bits, Home Premium 64Bits, Ultimate 64Bits)
6.-Al the Windows Updates availabe installed
7.- Starting the machine in Safe Mode with Win7 generic driver (NO PROBLEM) , using Nvidia VGA driver in safe mode will freeze (problem)
8.- Update the the BIOS of the VGA to F3 (was F2)
9.- Activate ACPI 2.0 option in motherboard BIOS
The only thing that works is to NOT install any video driver and use only the generic one that comes with windows, this way will pass de logon screen and works perfect (except the parts that need some sort of video like aero, games, etc.)
Really don´t know what else to try except RMA....