I have motherboard GIGABYTE GA-H77-DS3H and video card GIGABYTE GeForce GTX 660Ti. When I place it in PCIEX16 I have no video signal and motherboard makes 1 long and 2 fast beeps (which means video card problems). But it seams windows starts, because hard drive works after this. When I place my video card in PCIEX4 everything works properly.
I updated all drivers and bios on motherboard (it seams video card has the last version). I tried different bios options: disabling internal graphics, switching between "Init Display First" options.
Please suggest anything. I have no idea what to try next. Are there some jumpers or bios options to disable crossfire? Was it a bad idea to buy motherboard that supports crossfire and place GeForce in it?
UPDATE: Yesterday I dismantle my PC to pieces and reassemble it again. After that all works perfectly. I am not sure what was wrong. Most likely there was some dust on CPU, because its the only thing I have not touched before. Anyway, this was probably my fault :(