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black screen before logon screen and after login success

black screen before logon screen and after login success
« on: August 18, 2013, 06:30:30 pm »
Hello, i've got:

Gigabyte GeForce GTX 670 OC 2GB GDDR5

the hardware specs:

Motherboard:

Sapphire x58 pure black edition


power supply hx 1000W corsair

win 7 x64 sp1 64 bits

one hardrive 1tb sata 3

i7 920

4 Gb or ram kingston 2*2 Gb

The problem:

System works ok, but before screen logon of windows 7, a black screen shows, it could be fewer duration sometimes, but sometimes it could be longer. Then, when login is succesfull, sometimes appears a black screen, t could be fewer duration sometimes, but sometimes it could be longer, or sometimes it is unnapreciable. I have got 314.22 wql drives, but if i test newer drivers, it is worst than this version. What really happen?.