Hi.
Firstly, thanks for your reply and your assistance. I've tried it (your suggestion). But again didn't work. It still takes 20-30 seconds to see POST screen. All the coolers run as normal (at 100% speed), all the lights are on but there is nothing. Motherboard doesn't sound the "beep" voice before 20-30 seconds.
I sent an e-mail to Gigabyte GTS but they offered a solution which is some kind joke. They told me to update BETA bios. But they do not gurantee anything. They don't care if my CPU or GPU fails because of BETA bios. They also don't gurantee if my motherboard fails with BETA bios.
I've tried nearly everyting instead of BETA bios. I won't try it. A beta bios shouldn't be told as a solution. Because beta bios needs solution itself. What else can I do now?
If I cannot find any solution in a few days, I'm gonna give it back and buy another motherboard which is absolutly not a Gigabyte product.