Computer Problem - help!



So I just finished my first build, but i´ve been having a problem: When the PC stays turned off for a while and I try to turn it on, it takes a couple of minutes to it respond and starts to turn on. I´ve already updated the BIOS, but it didn´t solve my problem


My setup:

-Asus Sabertooth Z77

-Power Supply: SeaSonic 850W

-intel I7 3770K

This seems to be a known problem with asus z77 motherboards, my motherboard is an asus z77 aswell and I get the same problem booting from cold and I havent been able to find a soloution. If you find one I would really apreciate it.

After a long time, I sent my PC to a specialist, and he said that the problem actually was the power supply...