Windows 7 x64 SP1 Ultimate
I just got a Z77X-UP5, which looks lovely. Sadly, it hangs just before the welcome screen. I tracked it down to the official HD4000 drivers. Without the HD4000 drivers installed, it works fine (safe mode as well). When loading HD4000 drivers, it loads right up to the point where the welcome screen should appear and then it hangs on a black screen; num lock is lit and stuck.
I tried two versions of the HD4000 drivers: 220.127.116.11.2817 (latest from Intel) and 18.104.22.168.2712 (latest from Gigabyte)
I also tried two BIOS versions: F4 (came with the board) and F10 (latest from Gigabyte)
I also did a fresh Win 7 x64 install. It worked fne until I installed the HD4000 drivers, after which it did exactly the same as above.
Anyone had this issue and has any tips for me or should I RMA the board?
p.s. I tried until now a Gigabyte Z77X-UD3H, Z77X-UD5H and an Asus Maximus V Gene ... no such problems as above on any of these 3 boards.